Is there any reason why you are picking the worst rodent species for breeders?

Mice, rats and rabbits are the most popular rodent feeders for a reason. They are easy to house, easy to breed, and they are highly productive.

Guinea pigs usually have less than 6 babies, they're pregnant for about 9 weeks, and they're just not a great choice. If you have a reptile that east guinea pig size prey I would suggest that you breed rabbits instead. They're a much better choice.