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Boars

Male guinea pigs have testicles, which develop at a fairly young age. In babies, the testicles are not quite apparent, but it is still possible to decode their gender.Is there a faint "pucker" of skin? That is the retracted penis. If you press gently above this dough nut-shaped area, you'll feel a small muscle spasm and the penis will pop out. Be very gentle when pressing.

Sows

Female guinea pigs will have a "Y" shaped genital region, right next to the anus. If you look closely, you will notice that the genitals and the anal opening appear to be almost one and the same, due to the folding of the skin.

Maturity

Males are sexually active as early as 3 weeks, and should be observed closely. Males that mount others, should be promptly separated from the mother and any females, as they can breed. And it only takes a few seconds for a sow to become pregnant. Females can stay with the mother as long as needed. Guinea pigs can generally be separated from their mother at four to five weeks.