Infant feeding, breastfeeding and common infant feeding

• Feeding an infant is best understood as a continuum: breast milk, where possible, gives the best nutrition and immune protection for the first six months and remains valuable for two years or more, and solid foods are added from around six months while milk continues.
• Breastfeeding is a learned skill, not an instinct; a feeding assessment fixes most problems before they become failures.
• Effortless regurgitation after feeds is a normal developmental event that affects at least 40 percent of infants and fades in 90 percent before the first birthday; it is treated with reassurance unless red flags appear. ^[4]
• Infantile colic is common (20 to 30 percent), is self-limiting, and resolves without specific treatment by four to five months.
• Cow's milk protein allergy is uncommon (about 0.5 percent) and is diagnosed by a careful history and a strictly time-limited elimination diet with planned reintroduction, not by unvalidated tests.
• No single schedule fits every baby. Respect hunger cues, support the mother, and treat feeding as a public-health priority as much as a clinical one.

By the end of this page you should be able to:

1. Explain the benefits of breastfeeding to mother and infant, and state the situations in which breastfeeding is absolutely or temporarily contraindicated.
2. Describe a stepped approach to the common formula-fed and breastfed feeding problems of early infancy.
3. Advise a family on when to start complementary foods, how to introduce them, and why timing and texture matter.
4. Recognise normal regurgitation, decide when investigation is needed, and apply the initial management of gastro-oesophageal reflux.
5. Diagnose infantile colic accurately, exclude red flags, and calm the family while searching for cow's milk protein allergy when standard measures fail.
6. Define cow's milk protein allergy and its non-IgE and IgE patterns, and run a proper elimination and reintroduction.
7. Red-flag the babies who need same-day assessment rather than feeding advice.

Feeding is the central clinical and developmental task of infancy. The evidence for breastfeeding is unusually coherent across settings: early, exclusive and continued breastfeeding protects the infant against pneumonia and diarrhoea, supports growth and brain development, and is linked to better schooling and adult income, while mothers who breastfeed have lower all-cause mortality and lower risks of breast and ovarian cancer. ^[1] Yet only about 47 percent of infants aged 0 to 6 months worldwide are exclusively breastfed, which is why infant feeding is treated as a population-level problem as much as a bedside one. ^[1]

The practical mistake is to treat every feed as a medical event. Most babies feed, regurgitate a little, cry in the evening, and thrive. The clinician's job is to protect that normal process, to recognise the minority who genuinely need help, and to avoid turning normal feeding into disease. This page covers the normal physiology first and then each of the common problems, with the management steps in the order a parent will meet them.

WHO and UNICEF recommend that all infants initiate breastfeeding within 1 hour of birth, are breastfed exclusively (fed only breast milk) for the first 6 months, and continue breastfeeding up to 2 years or beyond while nutritionally adequate, safe complementary foods are introduced from six months. ^[1]

Breast milk is not merely food. It is an active biological fluid that supplies energy, specific nutrients and immunological factors together, and it adapts in composition during a feed, across the day and across development. In quantitative terms, breast milk can provide half or more of an infant's energy needs between 6 and 12 months, and one third between 12 and 24 months, which is why abrupt weaning at six months would waste a major nutrient source. ^[1]

The benefits cluster in four groups. ^[1]

• Infection protection. Exclusively breastfed infants have lower mortality from pneumonia and diarrhoea in all settings, and the protection persists to a lesser degree in high-income countries.
• Growth, cognition and later outcome. Breastfed children are less likely to be overweight or obese, score better on intelligence tests, and have higher school attendance and, in adult life, higher income.
• Maternal health. Breastfeeding lowers the risk of ovarian and breast cancer, prolongs the spacing between pregnancies through the lactational amenorrhoea effect, and reduces maternal all-cause mortality.
• Economics. Scaling up breastfeeding support is estimated to cost little for large returns in cognitive and economic outcomes; the cost of underfunding is estimated at US$ 339 billion a year globally. ^[1]

Most difficulty in the first two weeks is mechanical: a poor latch that leaves the mother sore and the baby underfed. Common, evidence-based supports endorsed by WHO include placing the infant skin-to-skin immediately after birth, supporting initiation within the first hour, rooming-in so mother and baby stay together 24 hours a day, avoiding additional feeds unless medically necessary, and offering breastfeeding counselling at every contact. ^[1] Responsive (on-demand, day-and-night) feeding, rather than by a clock, is the physiological pattern milk supply follows. ^[1]

A useful clinical rule is to base assessment on output rather than drowsy contentment: a wet nappy count and weight trajectory tell the truth more reliably than maternal confidence or crying alone.

Few drugs are absolutely incompatible with breastfeeding. Before prescribing, check a lactation reference such as LactMed rather than relying on memory. Before prescribing to a breastfeeding mother, check a lactation reference such as LactMed rather than relying on memory; most medicines are compatible with breastfeeding and are decided case by case. ^[6]

Globally, breastfeeding is preferred in almost all circumstances, including premature infants, infants of mothers living with HIV in high-mortality settings, adolescent mothers and infants who are malnourished. ^[1] The situations below are the genuine exceptions and are classified as ones where the infant should never receive the mother's milk, ones where breastfeeding can resume once treated, and medical or infant conditions.

The infant should receive formula, not the mother's milk, in the following circumstances. ^[6]

• Classic galactosemia in the infant, a rare inborn error of metabolism. ^[6]
• HIV in the mother when there is no ART, or when sustained viral suppression has not been achieved during pregnancy and at delivery; a mother with HIV who is on effective treatment with sustained suppression may breastfeed, and in settings where national authorities advise breastfeeding for HIV, it is associated with very low transmission. ^{[6] [1]}
• HTLV type I or II infection. ^[6]
• Illicit drug use, for example opioids, phencyclidine or cocaine. Mothers on stable methadone or buprenorphine maintenance therapy after discontinuing illicit opioids are instead encouraged to breastfeed. ^[6]
• Suspected or confirmed Ebola virus disease. ^[6]

• Untreated brucellosis, active tuberculosis, and active varicella around delivery (the mother may feed expressed milk for tuberculosis and resume direct breastfeeding once the treating clinician judges her non-infectious). ^[6]
• Active herpes simplex lesions on the breast: the infant feeds from the unaffected breast with the affected side fully covered, and once healed, breastfeeding resumes fully. ^[6]
• Monkeypox (mpox) virus infection, with feeding delayed until all lesions have resolved and a fresh layer of intact skin has formed. ^[6]
• Certain medications and diagnostic radiopharmaceuticals, decided case by case; most medicines are compatible, and the risk is weighed against the benefit of continued breastfeeding. ^[6]

Mothers with an intercurrent illness such as mastitis, or who need hospital treatment, usually continue breastfeeding; the infection itself is not a reason to stop. Untreated, active tuberculosis and brucellosis are the classical reasons for temporary interruption. ^[6]

Low birth weight and premature infants are supported to breastfeed as soon as they are clinically stable, with alternatives (expressed milk, donor milk or formula) only when the infant cannot feed directly. ^{[1] [6]}

Commercial infant formula is appropriate when breastfeeding is not possible, contraindicated or insufficient, and when it is safely prepared. Where it is used, the principles are current and unglamorous: use a standard, iron-fortified infant formula rather than unmodified animal milks in early infancy, make every feed fresh or keep reconstituted formula strictly refrigerated, and follow a recognised safe-preparation guide (clean hands and equipment, safe water, correct concentration). ^{[1] [6]}

A few errors cause disproportionate harm and deserve emphasis.

• Do not give unmodified cow's milk, goat's milk or plant-based drinks as the main drink in early infancy. Unmodified animal milks have a renal solute load and protein content that immature kidneys and the developing gut do not handle, and their low iron content risks deficiency. ^{[2] [3]}
• Do not overdilute or concentrate formula. Water alone in a bottle risks water intoxication and hyponatraemia; concentrated feeds risk hypernatraemia and excessive weight gain.
• Do not prop a bottle or put a baby to bed with one. It disorganises satiety signalling and risks dental caries and aspiration.
• Do not treat formula as a medicine. Switching brands in search of a better stool or less crying is rarely helpful and unsettles the family.

There is no consistent evidence that one standard cow's-milk formula prevents allergy compared with another, and so-called hypoallergenic formulas sold for general prevention are not supported for healthy infants. In the allergic infant (see the section on cow's milk protein allergy), the choice of formula becomes specific and needs a dietitian. ^{[5] [7]}

Mixed feeding is common and need not be a failure. A supply-and-demand approach, with frequent breastfeeding and formula top-ups sized to need, preserves the immunological benefit of continued breastfeeding and protects the ongoing milk supply.

Complementary (solid) food usually becomes necessary at around 6 months, because by that age breast milk or formula alone no longer meets energy and micronutrient needs, notably iron and zinc. Starting before 4 months increases the risks of infection and later obesity, and starting much later than 6 months risks growth faltering and micronutrient deficiency. WHO and UNICEF set the practical window at about 6 months while continued milk feeds, ideally breastfeeding, go on to 2 years or beyond. ^{[1] [2]}

Across national guidelines surveyed in Europe, almost all recommend exclusive breastfeeding for the first 6 months, but 82 percent also allow introduction of complementary foods before 6 months (mostly from 4 months onwards), reflecting a residual disagreement in practice; the clinician should explain why the 6-month anchor is preferred while acknowledging that guidelines differ. ^[3]

WHO lists the principles plainly: practise responsive feeding, maintain hygiene and safe food handling, start at 6 months with small amounts and increase gradually, increase consistency and variety, and reach 2 to 3 meals a day at 6 to 8 months and 3 to 4 meals a day at 9 to 23 months, with 1 to 2 additional snacks as required. ^[1] Fat should not be restricted, energy density matters in low-resource settings, and iron-rich foods (meat, fish, eggs, pulses) should be introduced early because stores deplete around the end of the fifth month. ^{[3] [2]}

Food allergy prevention has moved in favour of early introduction rather than prolonged avoidance: in populations with a high prevalence of peanut allergy, peanut (introduced in a safe form such as smooth unsalted peanut butter) is recommended at 4 to 6 months, and cooked egg is introduced early. ^[3]

From the middle of the first year, progression from smooth to mashed to soft finger-foods within weeks teaches chewing and reduces later texture refusal. Responsive feeding means trusting the baby's hunger and satiety cues; pressure to finish bowls overrides the infant's appetite regulation and is linked to later overweight. ^{[1] [2]}

• Vegetarian and vegan weaning can be nutritionally adequate but needs professional input for iron, vitamin B12, vitamin D, calcium, DHA and zinc, and supplements are commonly required.
• Weaning a premature infant follows the same principles but is timed by the infant's corrected age and needs a dietitian.
• For the formula-fed infant who is older than 6 months, complementary foods are added in the same way and the normal adult family foods are the goal from 12 months.

Gastro-oesophageal reflux (GOR) is the passage of gastric contents into the oesophagus and is a normal physiological event at all ages; it is asymptomatic in most infants. The minority with symptoms severe enough to merit medical attention, or with complications such as oesophagitis or aspiration, have gastro-oesophageal reflux disease (GORD). ^[4]

Effortless regurgitation of feeds affects at least 40 percent of infants, usually begins before 8 weeks of age, can occur 6 or more times a day in 5 percent of those affected, and resolves in 90 percent of affected infants before they reach 1 year. ^[4] Regurgitation is usually manged with advice and reassurance, and the infant needs no investigation or treatment. ^{[4] [7]}

NICE defines infants as under 1 year old; infants with regurgitation should be placed on their backs to sleep in line with sudden-infant-death prevention advice, and positional management must never be used for reflux. ^[4]

The stepped approach to a formula-fed infant with frequent regurgitation and marked distress is: review the feeding history, then reduce volumes only if they are excessive for weight, then small frequent feeds while maintaining the total daily amount, then a thickened formula. ^[4] In a breastfed infant with the same picture, a breastfeeding assessment comes first. ^[4] Alginate therapy can be offered for 1 to 2 weeks if distress persists. ^[4]

Acid-suppressing drugs (proton pump inhibitors and H2 receptor antagonists) should not be offered for overt regurgitation in infants as an isolated symptom, because the benefit is not established and the harms are real. ^[4] Upper gastrointestinal contrast studies are not offered to diagnose or assess GORD in infants or children. ^[4] Anti-regurgitant medications such as metoclopramide, domperidone and erythromycin are reserved for situations where the potential benefits outweigh risks, other measures have been tried, and a specialist paediatric professional agrees; metoclopramide is contraindicated in infants. ^[4]

Projectile vomiting in an infant under 2 months, bile-stained or blood-stained vomit, regurgitation starting after 6 months or persisting beyond 1 year, blood in the stool, abdominal distension or tenderness, onset of crying with distress in the context of atopy, faltering growth associated with regurgitation, and systemic symptoms such as fever, altered consciousness, a bulging fontanelle or a rapidly increasing head circumference all demand investigation for causes other than reflux, including pyloric stenosis, intestinal obstruction, cow's milk protein allergy and raised intracranial pressure. ^[4]

Infantile colic is defined by Rome IV as recurrent periods of inexplicable crying, fussing or irritability in an apparently healthy infant aged less than 5 months. ^[7] It affects an estimated 20 to 30 percent of infants and usually begins within the first few weeks, peaking at about 5 to 6 weeks and resolving without intervention towards 4 to 5 months. ^[7] The classic Wessel criteria (crying more than 3 hours a day, on more than 3 days a week, for at least 3 consecutive weeks) are still used in many studies but Rome IV dropped the arbitrary 3-hour cut-off because the prolonged, inconsolable character of the crying matters more than its duration. ^[7]

Colic is classified as a disorder of gut-brain interaction, and it is now understood as a symptom pattern rather than a diagnosis: the same appearance may be caused by feeding technique, normal crying in a sensitive temperament, environmental and family factors or, in a minority, by an underlying illness or cow's milk protein allergy. ^[7]

The first intervention is the cheapest and most effective: a consistent, calm message that the baby is not in pain and will outgrow it, paired with practical support. Crying activates the parent's stress response and infant crying increases when the parent is stressed, so the clinical encounter is itself part of management. ^[7]

Practical steps that have a reasonable basis are: a breastfeeding assessment to check the latch and intake, a feeding and burping technique check, avoidance of overfeeding and of smoky environments, soother use if the family chooses, baby massage and carrying, and whatever reduces the parent's anxiety (including a second pair of hands and a break). ^[7] Acid-suppressing drugs do not help colic even when reflux is suspected. ^[7]

Colic is a common reason for the overuse of antacid therapy in infants. NICE NG1 advises against acid-suppressing drugs for isolated regurgitation, and the available evidence shows no benefit of acid suppression for crying. ^{[4] [7]}

Cow's milk protein allergy presents with crying as one feature, but usually alongside other signs including diarrhoea, blood or mucus in the stool, reflux, eczema or faltering growth, and those combinations are what define non-IgE-mediated allergy under NICE's criteria. ^[5] Where standard colic management has failed and other allergic symptoms are present, cow's milk protein allergy can be tested by a diagnostic elimination diet. ^[7]

The diet is a 2 to 4 week trial of maternal cow's milk elimination in the breastfed baby, or an extensively hydrolysed cow's milk or hydrolysed rice formula for the formula-fed one. ^[7] If the baby's symptoms fall substantially, cow's milk is reintroduced to confirm the diagnosis before any long-term restriction. ^[7] For colicky babies without any other allergic signs, the evidence that milk causes the colic is weak and elimination should not be the default. ^[7]

Lactobacillus reuteri DSM 17938 has randomised-trial support in breastfed infants with colic, with variable results in formula-fed infants. A time-limited trial in a breastfed baby whose family wishes to try it is reasonable, recognising the evidence base is mixed; probiotics are not a substitute for the measures above.

Cow's milk protein allergy is one of the most common food allergies of infancy but is still relatively uncommon: the EuroPrevall birth cohort of 12,000 infants found an incidence of 0.54 percent for IgE-mediated and non-IgE-mediated CMPA combined, confirmed by oral food challenge. ^[7] IgE-mediated reactions are immediate and non-IgE-mediated reactions are delayed, both to the same family of milk proteins.

NICE separates the presentation by mechanism. IgE-mediated presentations include acute urticaria, oral itch, acute angioedema, vomiting and diarrhoea shortly after milk, and anaphylaxis. Non-IgE-mediated presentations include gastro-oesophageal reflux, loose or frequent stools, blood or mucus in the stool, abdominal pain, infantile colic, food refusal, constipation, perianal redness and faltering growth, often in combination. ^[5] A typical story - vomiting and loose or bloody stools within hours to days of switching to formula, or an eczematous baby who flares on cow's milk - makes the diagnosis likely; a screening blood test without that history does not. ^[5]

CMPA must be distinguished from lactose intolerance, which is an osmotic diarrhoea and is uncommon in infants except transiently after gastroenteritis, and from acute gastroenteritis itself. ^[5]

The diagnosis rests on the history. In non-IgE-mediated CMPA, NICE advises a trial elimination of the suspected allergen for between 2 and 6 weeks with reintroduction afterwards and dietitian support, because this is both the diagnostic test and the first step of management. ^[5] For a breastfed infant, the mother eliminates cow's milk from her own diet; for the formula-fed one, an extensively hydrolysed or amino acid formula replaces standard formula. ^{[5] [7]} In IgE-mediated CMPA, a skin prick or specific-IgE test is offered only on the basis of the history, by staff competent to perform and interpret it, and the result is interpreted in clinical context. ^[5]

The rules that protect against over-diagnosis are: do not test without a clinical history, do not use serum-specific IgG or alternative tests (vega, kinesiology, hair analysis), and always plan reintroduction rather than an open-ended diet. ^[5]

Dietitian-led management means checking nutritional adequacy during elimination, supporting the mother to continue breastfeeding, and setting a date for reintroduction. Most infants outgrow CMPA during early childhood, so review and planned challenge rather than indefinite restriction is the normal approach.

• Vomiting that is bile-stained, blood-stained or persistently projectile in a baby under 2 months. ^[4]
• Regurgitation commencing after 6 months of age or persisting beyond 1 year. ^[4]
• Blood in the stool with or without mucous, especially in an atopic family, suggesting CMPA or infectious colitis. ^{[4] [5]}
• Poor feeding, food refusal or feeding aversion with regurgitation, and any faltering growth. ^{[4] [5]}
• Dehydration, lethargy, fever, altered responsiveness, bulging fontanelle, rapidly increasing head circumference. ^{[4] [5]}
• Feeding difficulties in an ill, preterm or potentially infected newborn are managed under neonatal infection guidance rather than as a routine feeding problem. ^[8]

• Prematurity. Breastfeeding is supported early; complementary foods are timed to corrected age; feeding problems are more common and referral thresholds are lower.
• HIV-exposed infants. Where a mother is on effective ART with sustained suppression, breastfeeding can proceed with very low transmission risk; in settings where national authorities advise breastfeeding, exclusive breastfeeding for 6 months and continuation to 12 months or longer applies. ^[1]
• Low-resource settings. Exclusive breastfeeding for the first 6 months has its largest protective effect where infection is common; unmodified milks in early infancy and premature cessation of breastfeeding are high-risk practices. Complementary foods should be nutrient-dense, home-prepared where possible, and safe. ^{[1] [2] [3]}
• Maternal wellbeing. Depression, exhaustion and inadequate support are the commonest modifiable causes of perceived low milk supply; address them before adding formula.

• Breast milk is the sole feed for the first 6 months, and remains a major nutrient source to 2 years or beyond. ^[1]
• Initiate breastfeeding within 1 hour and exclusively breastfeed for 6 months; then add complementary foods while breastfeeding continues. ^[1]
• Only about 47 percent of infants worldwide are exclusively breastfed at 0 to 6 months; support at system and household level matters. ^[1]
• Breastfeeding is contraindicated with classic galactosemia, unsuppressed maternal HIV, HTLV I/II, active illicit drug use and Ebola disease, and temporarily with untreated brucellosis, TB, varicella and HSV on the breast. ^[6]
• Formula feeding is safe when needed: use standard iron-fortified formula, avoid unmodified animal milks in early infancy, and prepare feeds safely; do not substitute it for breastfeeding when breastfeeding is possible. ^{[1] [2]}
• Complementary foods are introduced at about 6 months, reaching 2 to 3 meals daily at 6 to 8 months and 3 to 4 meals daily at 9 to 23 months, progressing in texture. ^[1]
• Effortless regurgitation is normal (at least 40 percent of infants) and resolves in 90 percent before 1 year; reassurance and feeding technique are the treatment. ^[4]
• Isolated regurgitation is not treated with acid-suppressing drugs. ^[4]
• Colic affects 20 to 30 percent and resolves by 4 to 5 months; it is managed with support and reassurance, and milk elimination is tried only for 2 to 4 weeks when there are other allergic signs or standard care fails. ^[7]
• Cow's milk protein allergy has an incidence of about 0.54 percent and is diagnosed by history, a time-limited elimination (2 to 6 weeks) and planned reintroduction, with dietitian support. ^{[5] [7]}
• A clear medical disclaimer applies: this content is educational and does not replace assessment by a paediatric professional.

Breastfeeding and infant nutrition; gastro-oesophageal reflux disease in children; food allergy in children and young people; vomiting, diarrhoea and dehydration in children; faltering growth; antenatal and postnatal care; neonatal infection.