Once the fetus is sufficiently developed, chemical signals start the
process of birth, which begins with contractions of the uterus and the
dilation of the cervix. The fetus then descends to the cervix, where it
is pushed out into the vagina, and eventually out of the female. The
newborn, which is called an infant in humans, should typically begin
respiration on its own shortly after birth. Not long after, the placenta
is passed as well. Most mammals eat this, as it is a good source of
protein and other vital nutrients needed for caring for the young. The
end of the umbilical cord attached to the young's abdomen eventually
falls off on its own.
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