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Published on: December 1, 2015
Insights
Human milk is superior for newborns due to immature infant digestive, metabolic, and excretory systems at birth. Its composition optimally supports infant needs during the critical perinatal period.
Area of Science:
- Neonatal nutrition
- Developmental biology
- Pediatric gastroenterology
Background:
- Infant feeding choices significantly impact neonatal development.
- The digestive, metabolic, and excretory functions of newborns are immature at birth.
- Human milk composition is uniquely adapted to these developmental stages.
Purpose of the Study:
- To analyze the biological basis for human milk's superiority in newborn feeding.
- To compare the developmental maturity of infant physiological systems with milk composition.
- To highlight the adaptive properties of human milk for the perinatal period.
Main Methods:
- Review of anatomical and physiological developmental milestones in fetal and postnatal life.
- Analysis of key enzyme maturation and metabolic pathway development in neonates.
- Comparison of infant physiological capacities with the nutritional and protective components of human milk.
Main Results:
- Intestinal development is largely complete by the 6th fetal month, but key enzymes mature postnatally.
- Major digestive enzymes (gastric, pancreatic) and metabolic functions (urea synthesis) are limited at birth.
- Excretory functions (sodium, osmotic load, hydrogen ions) are suboptimal, particularly in preterm infants.
Conclusions:
- Human milk's composition is optimally adapted to the immature physiological state of newborns.
- The protective properties of human milk are crucial for meeting infant needs in the perinatal period.
- Breastfeeding provides essential support for neonatal development and health.
Abstract:
The superiority of human milk as compared with milk of other origin for the feeding of newborns, term or preterm, can be analysed in terms of biological development related to digestive, metabolic and excretory functions during foetal and postnatal life. The macro- and micro-anatomical developments of the intestine are complete in the 6th foetal month. The brush border and some of its enzymes (saccharase-isomaltase) exist already from the 6th foetal week, whereas other enzymes (lactase and intracellular transport enzymes) appear much later. The major gastric and pancreatic enzymes, as well as the synthesis of biliary acids, do not reach maturity until after birth. Several metabolic functions, e.g. the synthesis of cystine from methionine, of tyrosine from phenylalanine, and of urea from ammonia, are still limited at the time of birth. The capacity for excretion of sodium, the osmotic urinary load, and hydrogen ions is suboptimal, especially in the prematurely born. All these circumstances imply that human milk, with its protective properties, represents optimal adaptation to the needs of the child in the perinatal period.
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