Hi!
Please separate any baby boars at 3 weeks or 250g - whichever comes first. Boars start making babies from 3-5 weeks of age, and that can include with their mother. The earliest recorded sibling pregnancy is 24 days.
#1 looks rather like a boar to me and #3 like a sow. #2 I need to see into the slit. But without seeing the slit, all I can do is just guess - and that is not the answer you want to get.
Please be aware that sexing the genitalia just from a picture has very strict limits and why it deteriorates so often into a free-for-all online guessing game or why people who do not know what to exactly look for get it wrong so often!
That is why we always ask our member to perform the hands-on part of the sexing process themselves as we cannot it for them. This means checking the not quite so obvious places where the gender is unmistakable.
However, I would think that learning exactly where to look, so you'll never ever have to rely on somebody else's judgment in order to sex guinea pigs is not the worst of life skills to have! It is not even all that difficult once you actually know where to look and what to look for...
Please follow the advice in our illustrated sexing guide, which will teach you exactly where to look and to feel. There are also comparison pictures of guinea pigs of various ages - including slit pictures.
Here is the link:
Illustrated Sexing Guide
I would strongly recommend to look at the guide first and have it handy next by. Then you get somebody else to hold the babies. Look first at your mother and gently pry her slit apart. Then you look at baby #1. Next at baby #3. And lastly at baby #2 - by then you should know how the two sexes differ and which gender your least obvious baby looks like.
