The gestation period of a guinea pig is between 59 and 73 days. Female guinea pigs may be sexually mature and capable of pregnancy as young as four weeks old. Guinea pigs typically carry between one and four babies, although they have been known to carry up to seven.
The birth of guinea pigs tends to peak in the spring, although they are capable of breeding year round and may produce up to five litters per year. Guinea pigs are born with partial eyesight and well-developed teeth and claws, making them mobile and capable of eating solid foods at birth, unlike most other rodents.