[Lelola]

You are 100% sure that she knows he is in a relationship with you? That you two were together officially 4 days after he had sex with her?

The dates aren't adding up unless he cheated on you or she kept it a secret for a month or two after the birth. Or even worse he did not tell you about knocking her up.

A paternity test is always a good. Then he should consider asking his parents to help get a lawyer to get his rights set. You should not help him with this financially if he cannot afford it. He should also consider having an agreement for child support. This way he knows what his legal responsibilities are and she could not play a pawn game down the line.