The gestation perod for all mammals is
2 months
9 months
the same
not the same

9 months

The gestation period for almost all mammals and in humans mostly is 9 months.
Gestation is the process where the embryo or the fetus inside of a female is developing to become a fully developed infant. Hence, the period is called the gestation period and approximately is 9 months. 
Gestation can take place at numerous numbers which now is called multiple gestation.