[Phenomenon of physiological hypobiosis in the fetus and newborn].
Within the first 2 weeks of postnatal life, neonatal response to stress (hypoxia, pain, etc.) is shown to de related to inhibition of vital processes rather than their activation as seen in the adults. In full-term fetuses and newborns, the pituitary, the adrenal cortex, the thyroid, the immune system, the heat-controlling system, etc. have been found to have a well-developed biosynthetic structure, capable of producing and secreting hormones, as early as the antenatal and early postnatal periods. There is a potential capacity for homeostatic reactions. The absence of active protective reactions in fetuses and newborns, while their realization is actually possible, might be explained through the assumption that the lack of engagement, avoidance of conflict, stowed-down vital processes in response to aggression may be a biologically-expedient form of protection; the same as it is in hibernating animals.
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D005260:Female; D005333:Fetus / Q000502:physiology*; D006706:Homeostasis; D006801:Humans; D007231:Infant, Newborn / Q000502:physiology*; D011247:Pregnancy
Iavlenie fiziologicheskogo gipobioza ploda i novorozhdennogo.