At what age can a guinea pig be bathed?

A guinea pig can be bathed one month after birth. One point matters: only bathe it after it has adapted to the environment.

If a newly bought guinea pig is already a month old but has not settled in, do not bathe it, because in a new setting it feels nervous and fearful, and bathing then may cause stress, lower resistance, and trigger disease. To avoid bad outcomes, do not bathe it while it is still unfamiliar with the environment.