Generally, it is believed that larger the animal, the longer the gestation period.
The healthy gestation period of women is minimum 266 days. Cattle with gestation period of 283 days and baboons with 245 days are the closest to human species. We also have mammals like Horses, Giraffes, Rhinos and few more who have gestation period more than 300 days.
But there are some species like Elephants which have a gestation period of more than 600 days. Sea mammals like whales have the gestation period of 360 days. On the other hand, sharks (particularly basking sharks) carry their young ones for a minimum of 3 years.
The species which have less than 100 days gestation period are Leopards, Dogs, Cats, Rabbits and few others.