When guinea pigs are pregnant will they always make a female and a male?

Question

I want to know if it is possible for G. pigs to make just boys/girls?

Answer 1

Well, yeah.

It's possible that a guinea pig will have, say, five babies, but three are female and two are male, or any variation, or they could have five female babies or five male babies.

It's like with humans. If left to nature, a woman may have three kids who are all girls, all boys, or a mix of both.

There's rarely a difference in this pattern, because species would die out if nature made them only have girls OR boys.

Answer 2

have you read http://www.cavyspirit.com/breeding.htm ?