The Raising and Care of Guinea Pigs
Guinea Pigs are very prolific, having about five litters a year, and from two to five at a litter. Three is a safe average.
The females are sexually mature at a month, but, of course, should not be bred at that age. Three months is plenty early enough and some breeders wait until they are even older.
The period of gestation is from 65 to 70 days. The young ones are fully developed when born and in a