After a gunnie pig gives birth how long before the baby can be removed from the mother?

AS long as there is a daddy in the cage she will continue to have babies though to many times is not good for them.

I had one that was always having babies til one day when they were born they all looked like aliens deformed out of 7 there was 1 Survivor that was normal.

they need to be separated from the daddy as soon as u know she is pregnant as the daddy will eat the newborns and like any one that can get pregnant give them a break

They can give birth 3-7 times a year if you don't give them breaks (which you should!)