PE7.1-3 | Breastfeeding Physiology and Milk Composition — Summary & Reflection

KEY TAKEAWAYS

Breastfeeding is anchored in a precise neuroendocrine circuit: suckling activates prolactin (anterior pituitary) to synthesise milk in alveolar lactocytes, and oxytocin (posterior pituitary) to contract myoepithelial cells and eject milk — the let-down reflex. Milk transitions from immunologically rich colostrum (days 1–3; high sIgA, lactoferrin, low volume by design) through transitional to mature milk (after 2 weeks; high fat hindmilk at the end of each feed). Human milk differs from cow's milk fundamentally: whey-dominant protein (60:40 vs 20:80) with DHA/ARA for brain development, high-bioavailability iron, HMOs as prebiotics, and a full immunological armamentarium absent from cow's milk, which also causes renal solute overload and occult GI blood loss. The WHO/IAP recommendation of exclusive breastfeeding for 6 months is evidence-based and supported by dramatic reductions in diarrhoea, pneumonia, NEC, and later non-communicable disease. Maternal benefits include uterine involution, LAM contraception, reduced breast/ovarian cancer risk, and psychological bonding via oxytocin. The most common barrier in India is cultural — prelacteal feeds, colostrum discarding, and dietary restrictions — all addressable with empathetic physiology-based counselling aligned with BFHI principles.

REFLECT

Think about a mother you have observed (during clinical postings) — or imagine the mother in the opening scenario — who was receiving conflicting advice about breastfeeding from family members versus health workers. What did you observe about how she made her decision? Now that you understand the physiology: if you were the treating paediatrician and you had 10 minutes with this mother at 48 hours of life, what three specific pieces of information would you prioritise — and how would you frame them so they resonate with her cultural beliefs rather than dismissing them? Kolb's reflective observation: practitioner knowledge is not simply about what you know, but about how you translate evidence into counsel that the patient will actually act on.