I have read that males will eat the babies if they were not from their own breeding. Is it the father of the babies, or an outside male?
But if they were already seperated, I don't know how he would "know" that they are his or not.. so it is a tough call. Personally I would not put this male with the female now, because at this late in the game, she might get set-off and kill her babies once they come.. or he might harass her when they're born, not knowing that they are his kids..
Tough call though. This is just what I would do.