Are Guinea pigs had a mess of litters. Are boy Guinea pig Marshmallow got into the girls cage and ended up getting them pregnant. We had a total of 8 litters and it was very crazy at times. 2 of the babies out of 29 ended up not making it.( they did not make it through the mothers birthing, but it was the 2 Guinea pigs first litter) All the mother Guinea pigs were around 5 months when this occurred and all babies came out healthy. We don’t want our babies to be alone so we insisted you take 2. We have 19 boys and 6 girls for sale. We hope you will take great responsibility for them!