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Neonatology, defined by the age of the patient rather than by a system of the body, is one of the few "generalist" specialties. Although the neonatal age range of about half a year seems narrow, more development occurs between 22 weeks of gestation (the earliest age of viability outside of the uterus) and 1 month after term than between birth at full term and adulthood and certainly than between the beginning and the end of adult life. The fetus has a peculiar two-layered environment consisting of the mother and her external milieu. The fetus is protected by the mother's homeostatic
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