Many mammals carry baby for 9 months . Human beings are best and well known example having 9 month pregnancy period .
The gestation periods for mammals differs greatly. In general it appears to be very short in small mammals, (some shrews and mice are only a few days) while increasing in length as the mammal increases in size. Elephants, hippos, bears whales and other large mammals have gestation periods lasting 9 to 18 months.
Spiders have an incubation period of 9-27 days.
Gestation refers to the period of pregnancy. ie - A human gestation period would be 9 months.
Oxytocin is produced by the pituitary gland and is responsible for starting contractions at the end on the 9 month gestation period.
The gestation period is 9 weeks, give or take a couple days.
As with any breed, the average gestation period is 9 weeks.
The ringed seal has a gestation period of 9 to 11 months Reference: http://animals.nationalgeographic.com/animals/mammals/ringed-seal/
9 months
The average gestation period for a bison is around 9 months.
The average duration of the human gestation period is about 9 months.
the 9-month gestation period is really not reliable at all so you can't go by that.
Humans have an average gestation period (time of pregnancy) of 280 days.