very small.
about the size of half you small finger.
they are born fully haired, eyes open and you can touch them with in 4 hours of birth.
About half the size of your hand.
if you ever seen a hamster a baby guinea pig is about the size of a hamster.
no, if its the father the male usually helps the mother.
Nope.
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.