sexual maturity of baby mice

Question
Hi Shawntiah, I don't know if you'll be able to help me out at all with a few questions I have regarding some baby mice my mouse, Spam, had 4.5 weeks ago.  Just this evening I noticed at least one of the male babies has taken a liking to it's mother and even possibly it's sisters.  From every thing I've read so far I've come to believe that male mice don't reach sexual maturity until 7-8 weeks though.  It's still a little early to seperate the babies from their mother but should I be concerned about any of the females getting pregnant even at this point in time?

Answer
you should begin to seperate the pups at four weeks of age, especiall if the male is taking an interest in the mother. mice have been known to mature at 4 weeks and if the male is trying to mate with his sisters or mom then the best thing to do is to seperate him.