For humans, it takes 9 months plus or minus 2 weeks.
That's to birth, It takes at least 16 more years to achieve physical (or sexual) maturity,
and 26 for mental maturity.
Fetuses develop nerves during the first trimester of pregnancy, around 5-6 weeks gestation.
The fetuses develop in the womb of the mother.
1 month
Yes, it is true that some human fetuses develop a tail during early stages of development. This tail, known as the coccygeal or embryonic tail, usually regresses and disappears as the fetus continues to grow.
About five years.
Patience.
imediately
No, they have baleen. Tooth buds do develop in fetuses, but these aren't retained.
It's May be take 2 days
A person does not 'develop' autism - a person is born autistic.
From the time your breasts begin to develop, it should take two to three years to completely develop, however some girls do develop slower or faster than that.
Eight thousands years