Mittens The Kitten said:
Genetics shouldn't mean anything in child-raising.
Well, if teh child is not the fathers, and he later finds out his wife has been cheating, he might end up leaving a child who has grown old enough to consider him it's father, instead of leaving an infant, who will never know him as a father, but might end up nkowing it's real father, who hopefully will accept his reponsibilities as a parent, and be a father for the child, instead.
I know it may sound cruel, but i can easily imagine someone leaving their wife and child if they find out she had been cheating and the child wasn't theirs.
Even though teh child never did anything, it'll still be a constant reminder to the not-fatehr that his significant other fucked around, and it could probably fuck up teh father/child relations big time.
Of course the real problem here are people cheating, not the child.