Infant Feeding & Breastfeeding

Infant feeding is one of the most heavily examined "easy-but-trap" areas in Paediatrics, because the cut-offs (when to start, what to give, how much), the WHO/IYCF definitions, and the milk composition figures are remembered imprecisely by most candidates. This note distils the high-yield numbers, definitions, named policies, and the few absolute contraindications that examiners love.

Definitions & IYCF terminology (WHO)

The Infant and Young Child Feeding (IYCF) framework uses precise definitions. Mixing them up is the single commonest reason candidates lose this question.

Term	Exact meaning
Exclusive breastfeeding	Only breast milk (including expressed milk / wet-nurse milk). Allowed: ORS, drops/syrups of vitamins, minerals, medicines. Not allowed: water, other liquids, any solids
Predominant breastfeeding	Breast milk + water-based fluids (water, juices, ritual fluids, ORS)
Complementary feeding	Breast milk + solid/semi-solid foods (started at completed 6 months)
Bottle feeding	Any liquid/semi-solid given from a bottle with a nipple/teat
Replacement feeding	Feeding a non-breastfed infant a diet that provides all nutrients (e.g. in HIV when criteria met)

High-yield: Exclusive breastfeeding permits ORS, vitamins, minerals and medicines but not water. This single line is asked repeatedly.

WHO/IYCF core recommendations (flow): Initiate breastfeeding within 1 hour of birth → Exclusive breastfeeding for first 6 months (180 days) → Introduce complementary feeding at completed 6 months → Continue breastfeeding up to 2 years and beyond.

High-yield: Exclusive breastfeeding is recommended for the first 6 months, not 4 months (older recommendation) — and complementary feeding starts at completed 6 months / 180 days, while breastfeeding continues till 2 years or beyond.

Physiology of lactation

• Lactogenesis is driven by prolactin (milk secretion) and oxytocin (milk ejection/let-down).
• Prolactin reflex – suckling → afferent impulses → anterior pituitary prolactin → alveolar milk synthesis. Prolactin is higher at night (so night feeds maintain supply).
• Oxytocin (let-down) reflex – suckling → posterior pituitary oxytocin → contraction of myoepithelial cells → milk ejection. This reflex is conditioned (helped by the mother seeing/hearing the baby; inhibited by pain, anxiety, embarrassment).
• Milk synthesis is also locally controlled by FIL (Feedback Inhibitor of Lactation) – full breast → milk production slows; emptied breast → production speeds up. Hence "demand feeding empties the breast and increases supply".

High-yield: Prolactin → milk secretion; Oxytocin → milk ejection (let-down). Oxytocin reflex is the one inhibited by maternal stress/pain.

Composition: colostrum vs mature milk vs cow's milk

Colostrum is the yellowish, thick milk of the first 3–4 days. It is low in volume but high in protein, vitamin A, sodium and immunoglobulins, and has a laxative effect (helps expel meconium and reduces neonatal jaundice).

Feature	Colostrum	Mature human milk	Cow's milk
Volume	Small (40–50 mL/day)	~750–850 mL/day	–
Protein	High	Low (1.1 g/dL)	High (3.3 g/dL)
Whey : casein	–	60–70 : 30–40 (whey predominant)	18 : 82 (casein predominant)
Main protein	–	Lactalbumin	Caseinogen
Fat	Lower	Higher	High (more saturated)
Lactose (carb)	Lower	High (7 g/dL)	Lower (4.5 g/dL)
Vitamin A, IgA	Very high	Lower	Low
Iron	Low but highly bioavailable (~50%)	Same	Low bioavailability (~10%)
Renal solute load	–	Low	High

High-yield: Human milk is whey-predominant (easy to digest, forms soft flocculent curds) with lactalbumin as chief protein; cow's milk is casein-predominant. Human milk has more lactose, less protein, less sodium than cow's milk.

Key composition facts to memorise:

• Energy of mature human milk ≈ 67–70 kcal/100 mL (similar to cow's milk).
• Human milk is deficient in vitamin K, vitamin D and iron (relative). Hence vitamin K at birth and the recommendation of vitamin D supplementation and timely complementary foods/iron.
• The main immunoglobulin in breast milk is secretory IgA; main protective protein is lactoferrin (binds iron, bacteriostatic); also lysozyme, bifidus factor (favours Lactobacillus bifidus), macrophages.
• Foremilk (start of feed) is watery, quenches thirst, high lactose; Hindmilk (end of feed) is fat-rich, calorie-dense, gives satiety. Emptying one breast before switching ensures hindmilk intake.
• DHA and AA (long-chain PUFA) in breast milk aid neurodevelopment and retinal development — an exam favourite for "why breast milk is superior".

Benefits of breastfeeding

To the infant: complete nutrition for 6 months, secretory IgA & immune protection (↓ diarrhoea, respiratory & otitis media), ↓ allergy/atopy/asthma, ↓ necrotising enterocolitis in preterms, ↓ SIDS, ↓ later obesity/type-2 diabetes, better neurodevelopment, promotes bonding, clean/safe/economical.

To the mother: uterine involution (oxytocin), lactational amenorrhoea (contraception), ↓ premenopausal breast and ovarian cancer, faster post-partum weight loss, ↓ post-partum haemorrhage.

High-yield: Necrotising enterocolitis (NEC) in preterm neonates is markedly reduced by breast milk — expressed mother's milk/donor milk is preferred over formula in preterms specifically for this reason.

Contraindications to breastfeeding

Most "absolute contraindications" questions test a short fixed list. Memorise them; everything else is usually not a contraindication.

Absolute infant-side contraindication:

• Galactosaemia (classic) — the infant cannot metabolise galactose; needs lactose-free/galactose-free formula. (Other inborn errors like maple syrup urine disease, PKU need partial/specialised feeds.)

Maternal contraindications:

• HIV — context dependent. As per current WHO/India guidance, if mother is on ART and infant on prophylaxis, breastfeeding is recommended (mixed feeding avoided); replacement feeding only if AFASS criteria (Acceptable, Feasible, Affordable, Sustainable, Safe) are met. Never mixed feed in HIV.
• Active untreated tuberculosis — separate baby until mother is non-infectious (≈2 weeks of treatment); expressed breast milk can still be given. Not an absolute contraindication once treatment started.
• Maternal drugs: anticancer/cytotoxics, radioactive isotopes, lithium, amiodarone, ergotamine, illicit drugs (cocaine, heroin), antiretroviral exceptions; chloramphenicol, tetracycline best avoided.
• HTLV-1 infection, untreated brucellosis, active herpetic lesions on the breast.
• Maternal HBV/HCV are NOT contraindications (HBV baby gets vaccine + immunoglobulin).

High-yield: Galactosaemia = the classic absolute infant contraindication. Maternal hepatitis B is NOT a contraindication. Mastitis is NOT a contraindication — continue feeding (or express) from the affected side.

Mnemonic for safe-to-continue conditions: breastfeeding continues in Mastitis, Maternal fever, Jaundice, Cleft lip, HBV, Diabetes — these commonly appear as distractors.

Complementary (weaning) feeding

Introduced at completed 6 months because by then milk alone cannot meet energy, protein, iron and zinc needs, and the gut/neuromuscular maturity (sitting with support, loss of tongue-thrust) is adequate.

Principles (the "FATVAH"/practical rules):

• Start with one food at a time, soft/semi-solid, energy-dense (add oil/ghee/sugar).
• Increase amount, thickness/consistency and variety gradually.
• Use responsive feeding; maintain hygiene to avoid weanling diarrhoea.
• Continue breastfeeding alongside.

Age	Consistency	Frequency (meals/day)	Approx amount
6–8 months	Thick purée / mashed	2–3 meals + 1–2 snacks	start 2–3 tbsp → ½ cup (250 mL)
9–11 months	Finely chopped / finger foods	3–4 meals + snacks	½ cup
12–23 months	Family foods, chopped	3–4 meals + snacks	¾–1 cup

Energy needed from complementary foods (because breast milk supplies the rest):

• 6–8 months ≈ 200 kcal/day
• 9–11 months ≈ 300 kcal/day
• 12–23 months ≈ 550 kcal/day

High-yield: Complementary feeding delayed beyond 6 months → growth faltering, micronutrient deficiency (iron, zinc); started too early (<4 months) → diarrhoea, displacement of breast milk, allergy, ↓ iron absorption.

Infant formula & cow's milk

• Cow's milk should not be given as the main drink before 1 year — high renal solute load, high protein/sodium, low iron, can cause occult GI blood loss and iron-deficiency anaemia.
• Formula is modified to humanise the protein (↑ whey), add iron, vitamins, LCPUFA. Used only when breastfeeding is not possible.
• Top milk/formula hygiene is critical in India — bottle feeding strongly discouraged because of contamination → diarrhoea; cup-and-spoon feeding preferred for expressed milk.

High-yield: Avoid whole cow's milk as a drink in the first year; if unavoidable it must be diluted, boiled, and sweetened — but iron-fortified formula or continued breastfeeding is preferred.

National programmes & policies (India)

These are very high-yield for the Indian exam (NEET PG, NEXT).

Programme / policy	Key point
Baby Friendly Hospital Initiative (BFHI)	WHO–UNICEF, Ten Steps to Successful Breastfeeding
IMS Act (Infant Milk Substitutes Act), 1992 (amended 2003)	Bans promotion/advertising of infant milk substitutes, feeding bottles and teats
MAA – "Mothers' Absolute Affection" (2016)	National programme to promote breastfeeding
Mother's Milk Banks / Comprehensive Lactation Management Centres (CLMC)	Donor milk for sick/preterm neonates
ICDS (Anganwadi)	Supplementary nutrition for <6 yr, pregnant/lactating women
POSHAN Abhiyaan (National Nutrition Mission, 2018)	Target reduction of stunting, undernutrition, anaemia, low birth weight
Janani Suraksha Yojana / Janani Shishu Suraksha Karyakram	Promote institutional delivery & early breastfeeding

High-yield: IMS Act 1992 prohibits advertisement and promotion of infant milk substitutes, feeding bottles and infant foods — a frequent one-liner. MAA programme = breastfeeding promotion.

Practical assessment & problems

Correct attachment (latch) – four signs: mouth wide open; lower lip turned outward; more areola visible above than below; chin touching breast. Good positioning = baby's head & body in line, facing breast, body close, whole body supported.

Problem	Key feature	Management
Sore/cracked nipples	Usually poor attachment	Correct latch; apply hindmilk; continue feeding
Engorgement	Bilateral, day 3–5, shiny taut breast	Frequent feeding, expression, warm compress
Blocked duct	Localised tender lump, no fever	Continue feeding, vary position, massage
Mastitis	Unilateral red wedge, fever, flu-like	Continue breastfeeding + antibiotics (anti-staph); rest
Breast abscess	Fluctuant, very tender	Incision & drainage; feed from other breast / express affected side
Not enough milk	Reliable sign = poor weight gain & <6 wet nappies/day	Reassure, frequent feeds, check attachment

High-yield: The most reliable sign of adequate milk intake is satisfactory weight gain and the infant passing dilute urine ≥6 times/day.

Key differentials / "look-alike" choices

• Galactosaemia vs lactose intolerance – galactosaemia is the contraindication; lactose intolerance in infancy is usually transient/secondary and not a contraindication.
• Physiological vs pathological feeding jaundice – early breastfeeding (suboptimal-intake) jaundice (first week, due to poor intake → ↑ enterohepatic circulation, managed by more frequent feeding) vs breast-milk jaundice (peaks 2nd week, prolonged, baby thriving, due to factors in milk; rarely needs brief interruption).
• Marasmus vs kwashiorkor – early weaning failure/insufficient feeding → marasmus; abrupt weaning onto low-protein starchy diet → kwashiorkor.

Recently asked / exam angle

• "Exclusive breastfeeding allows which of the following?" → ORS / vitamins / medicines (NOT water). Repeatedly asked.
• Duration of exclusive breastfeeding → 6 months; complementary feeding at completed 6 months, continue breastfeeding up to 2 years.
• Predominant breastfeeding definition (breast milk + water/water-based fluids) — distinguish from exclusive.
• Chief protein of human milk → lactalbumin (whey predominant); cow's milk → casein.
• Absolute contraindication to breastfeeding → galactosaemia.
• Hepatitis B / mastitis are NOT contraindications — classic distractor question.
• IMS Act 1992 — what does it regulate (infant milk substitutes & feeding bottles).
• Hormone for milk ejection → oxytocin; for secretion → prolactin.
• Energy from complementary food at 12–23 months ≈ 550 kcal/day.
• Reflex inhibited by maternal anxiety → oxytocin (let-down) reflex.
• MAA programme / BFHI Ten Steps — name-matching questions.
• NEC reduction — why breast milk preferred in preterm.

Rapid revision

1. Initiate breastfeeding within 1 hour; exclusive for 6 months; complementary at 6 months; continue to 2 years.
2. Exclusive breastfeeding allows ORS, vitamins, medicines — not water.
3. Prolactin = secretion (night-dominant), oxytocin = ejection (inhibited by pain/anxiety).
4. Human milk is whey-predominant (lactalbumin); cow's milk is casein-predominant.
5. Human milk has more lactose, less protein/sodium, low renal solute load vs cow's milk; relatively deficient in vitamin D, K and iron.
6. Colostrum = high protein, IgA, vitamin A; laxative; expels meconium, reduces jaundice.
7. Main breast-milk antibody = secretory IgA; protective proteins = lactoferrin, lysozyme, bifidus factor.
8. Foremilk = thirst-quenching, lactose-rich; hindmilk = fat- and calorie-rich (satiety).
9. Galactosaemia = classic absolute infant contraindication; HBV and mastitis are NOT contraindications; never mixed feed in HIV.
10. Avoid whole cow's milk before 1 year (IDA, high solute load); prefer cup-and-spoon over bottle.
11. Mastitis → keep feeding + antibiotics; abscess → incision & drainage.
12. IMS Act 1992 bans promotion of infant milk substitutes/bottles; MAA promotes breastfeeding; BFHI = Ten Steps; reliable sign of adequate intake = weight gain + ≥6 wet nappies/day.