Very cute kiddos!
As for sexxing, Babies 3 and 8 are definately boys, see how the spacing between urethra and anus is wider, and there is a little "pooch" of skin there (looks like a slight swelling where the testicles will be in the future)? Baby 2 is definitely a girl, with a very narrow spacing.
The others are harder to tell because of the angle of the shots, but you can use babies 2 and 3 as examples and compare the others to them. Its pretty easy to tell once you know the differences.
They are very cute! When they start eating solids in a couple of weeks, watch for slow growers and/or runny poops. This will be the first signs you will see of the dreaded megacolon.