As for revenge, even if you have it, you still cannot remove your wife's adultery.
All you can do is....move on --->
Wishing you a better life from now onwards
Good advice...time to MOVE on..the KID is all that matters.
All kids are in a state of innocence.
Take joy in bringing up the kid.
A woman who can dump her own small child for any reason
is not worth it even for a minute to keep.
So in a way, he is lucky by her action.
He got his kid and the chance to dump a woman cheat.