A baby rat is called a pup. Sometimes they are also referred to as pinkies. The rat gestation period last 21 to 23 days, and the entire labor and birthing process only lasts about two hours.
Baby rats are hairless when born and completely dependent on the mother because they are blind and deaf. By the time the pups are 2 weeks old, they have hair and can see and hear.
The female rat, or doe, can give birth to litters of six babies or more. The more litters she has, the bigger the number of babies in each litter.