Quote Originally Posted by Pork Chops N' Corn Bread
I keep a pair in a 40 breeder
I sure hope they are separated somehow, being as they are TOO young to be breeding, not to mention hairless. Hairless rats need haired buddies to keep warm enough. Try and put a divider in that tank and get another pair, one male and one female, that both have hair. Put them with their respective buddies, and leave them alone for a few months so you KNOW they are old enough to breed. 2-3 month old rats surely aren't big enough or old enough to have babies(they CAN, but it doesn't mean it is right).