Wow! Those babies sound so cute. (sigh) I wish I could go back and do the baby rat thing all over again. Anyway, if they're really young, how do you know that they're girls? Remember, girls have a little bump that's really close to their tush hole, and boys' bumps are kinda bigger and are further away, almost on their belly.
What do they look like? When they're young you can at least tell if they're hooded or light or dark or berkshire (white on their bellies). Details, details!
Lila