Hi guys. I have 1.4 rats, bing in 2 groups of 2 with the male rotating evry couple weeks. The problem is, I have been doing this for over 2 months and have no babies. What gives? They have water, eat lab block and whatever else I throw their way, and are all at least 3 months old. The male is 300 grams, the females are between 200 and 250. Where are my babies?