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After birth, babies first gain control over their lips and tongues, then their eye movements, followed by control over their neck, shoulders, arms, hands, buttocks, fingers, legs, and feet. There is a genetic cephalocaudal (head-to-foot) trend in both prenatal and postnatal development.
Finally, in adults, the head represents approximately 12% of the body length. The cephalocaudal trend is also the trend of infants learning to use their upper limbs before their lower limbs. The proximodistal trend, on the other hand, is the prenatal growth from 5 months to birth when the fetus grows from the inside of the body outwards.
Child development involves the biological, psychological and emotional changes that occur in human beings between birth and the conclusion of adolescence. It is—particularly from birth to five years— a foundation for a prosperous and sustainable society .
Physical development. Infants are usually born weighing between 5 pounds 8 ounces (2,500 g) and 8 pounds 13 ounces (4,000 g), but infants born prematurely often weigh less. [17] Newborns typically lose 7–10% of their birth weight in the first few days, but they usually regain it within two weeks. [17]
The nervous system develops enough to control some body functions. The eyelids open and close. The cochleae are now developed, though the myelin sheaths in neural portion of the auditory system will continue to develop until 18 months after birth. The respiratory system, while immature, has developed to the point where gas exchange is possible.
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From birth, the ovaries of the human female contain many immature, primordial follicles. These follicles each contain a similarly immature primary oocyte . At puberty , clutches of follicles begin folliculogenesis, entering a growth pattern that ends in ovulation (the process where the oocyte leaves the follicle) or in atresia (death of the ...
This may disrupt the neural circuits that control alcohol intake, encouraging people to drink more. Sleep "Ethanol—which is the active ingredient in alcohol—blocks you from getting into deep ...