Natural breastfeeding

Significance and uniqueness of breast milk

Rational nutrition in early childhood is a critical factor for adequate physical, neuro-psychological development, and the formation of a full-fledged immune response. The concept of "metabolic programming" exists: the infant's feeding pattern determines the specifics of their metabolism for years to come. This directly determines the future adult risk of metabolic syndrome, obesity, allergic disorders, and osteoporosis.

Unlike infant formulas with a stable chemical profile, breast milk is a dynamic, "living" substance. Its composition continuously adapts to the enzymatic capabilities of the infant's gastrointestinal tract. Nutrient concentrations are influenced by:

• The infant's age and current health status;
• Frequency of breastfeeding;
• Time of day (circadian rhythms);
• Climate conditions of residence.

To date, it is technologically impossible to create an artificial analogue of human milk that is identical or superior in properties.

Physiology of lactation and its regulation

According to WHO estimates, true physiological inability to produce milk is extremely rare—occurring in only 3% of women. Secretion synthesis in the mammary gland alveoli is ensured by four basic cellular mechanisms: exocytosis, water and ion secretion, lipid synthesis and transport, as well as the transport of immunoglobulins (Ig) from the extracellular space.

During pregnancy, gland preparation is regulated by placental lactogen, and in the postpartum period, control shifts to neuroendocrine reflexes dependent on nipple stimulation:

1. Prolactin. Produced by the anterior pituitary gland. Responsible for the proliferation of alveolar tissue and the initiation of intracellular milk synthesis.
2. Oxytocin. Produced by the posterior pituitary gland. Causes myoepithelial cells surrounding the acini and ducts to contract, thereby expelling milk.

As lactation becomes established, an autoregulation mechanism kicks in. The main stimulus for secretion is not the level of prolactin, but the regular emptying of the acini. Each gland locally controls production: if milk is not removed, inhibitory factors are activated to protect against excessive secretion. The main condition for maintaining lactation is the prevention of lactostasis.

Feeding technique and sucking biomechanics

Successful breastfeeding begins immediately after birth with skin-to-skin contact. Placing the infant on the mother's abdomen ensures initial colonization with optimal microflora and forms a close psycho-emotional bond.

The act of sucking itself is based on a cascade of innate reflexes: the rooting reflex (opening the mouth when the perioral area is stimulated), the grasping reflex, and the sucking reflex (creating negative pressure). Correct biomechanics are essential to prevent nipple trauma and ensure effective nutritional intake:

• Asymmetrical latch: the child's mouth should encompass not only the nipple itself, but also a large part of the AREOLA.
• Process anatomy: the lips fit tightly against the breast and are turned outward, the gums fixate the breast, and the tongue is positioned under the nipple, making wave-like peristaltic movements.

Priority is given to feeding on demand rather than by the clock. Rooming-in (rooming-in) significantly increases the chances of prolonged and successful breastfeeding. There are no strict posture regulations—any position comfortable for the mother is considered optimal.

Colostrum and its effect on the gastrointestinal tract

The production of primary secretion—colostrum—starts as early as the third trimester of pregnancy and lasts for the first few days after birth. It is a thick, sticky, yellow-white liquid. Despite its small volume in the first days, colostrum is critically important for the newborn:

• Nutritional profile: has high energy density, contains a high amount of protein with a reduced amount of water.
• Immunological protection: contains a colossal concentration of protective factors (Ig, leukocytes), preventing viral, bacterial, and pyoseptic complications.
• Physiological effects: has a laxative effect, which accelerates the evacuation of primary stool (meconium). Together with meconium, bilirubin is excreted, which reduces the risk of developing severe neonatal jaundice. The secretion also stimulates the colonization of the intestine with optimal microflora and promotes the morphofunctional maturation of the gastrointestinal tract.

Classification of feeding types

The evolutionarily justified biological norm is the continuous chain of "pregnancy — childbirth — lactation." Disruption of this chain without strict medical indications is unacceptable. Pediatrics distinguishes three types of nutritional support:

1. Exclusive breastfeeding: feeding exclusively with breast milk. Supplemental feeding with water, tea, or juices is completely excluded.
2. Mixed feeding: a combined diet in which the child receives both breast milk (at least 150–200 ml per day) and complementary adapted formula.
3. Artificial feeding: complete replacement of human milk with industrial substitutes (formulas).

Class and exam questions

What else to study on this topic

• Pathologies associated with impaired metabolic programming (obesity, osteoporosis, metabolic syndrome).
• The influence of circadian rhythms and climatic conditions on changes in the composition of breast milk.
• The cascade of innate neonatal reflexes (rooting, grasping, sucking) and their evaluation.
• Cellular mechanisms of secretion in the alveoli (exocytosis, transport of lipids and immunoglobulins).
• Prevention of lactostasis and the effect of psycho-emotional stress on the oxytocin reflex.

Other topics in "Chapter 3. Adaptation, Early Childhood Nutrition, Rickets"

Prepared by WhiteCoat Pro faculty in accordance with the medical school curriculum. For educational purposes only.