It depends on the creature in question.
9 months
62 days
when you are a baby the bones then were cartilage
5 to 7 years is the correct
it takes 9 months for the baby to come out and the babe eats yok wen its inside the mothers stomach :)
amniotic thickening
A baby tiger takes about 3 to 3 and 1/2 months to develop.
A baby will take about nine months to develop inside a woman.
i think,9 months.
about 650 days
36 -40 weeks
22 months.
Humans need about 9 months to develop before being born
A pregnancy is 9 months for humans.
A cow's gestation period is about nine months (279 days long).
The gestation period of mice is around 20 days.
The gestation period of mice is around 20 days.
Baby rats first open their eyes at two weeks.