if its a male they mate with a female if its female they mate with a male the female becomes pregnant and give live birth in a couple weeks. all mammals are like this
When they are first born and up to 4 weeks old the mother will feed them milk that she makes for them. She will teach them by showing them what to eat and drink. and how to be with other guinea pigs.
No. I know because they might try to mate with eachother, if they are different genders if they are the same gender, they will fight, so put them in different cages!