Look, you are being wise. It is estimated that up to 25% of the children born to married couples are not actually the offspring of the husband.
Women have been happy to scream about what they want, tell you how you are being mean or abusive or untrusting, unloving and so on when you do not want to go along with their wants, even if their wants offend or hurt you. So, reverse it and tell her that if she loved you and had nothing to be concerned about, this should not be any problem at all. Stand up for yourself. If the wife is mad, let her be. If she stays silent, let her. Men too often back down or give in, when they absolutely should not do so.
To be honest about it, simply as a matter of protocol, I think that every man should insist upon a paternity test as soon as the child is born.
By the way. Just read the comments you got from women and then tell me that they are not manipulative, self serving creators. Trust me, I bet at least one of those women who said you are wrong, knows for a fact that she has been passing a kid off to her husband and it is not his. And does she feel guilty about it or feel she is wrong? Of course not. That is just how women are. And when a man wants to stand up for himself and his rights and protect his interests, see how the females fangs and nails come out?