The child died more than two months after his birth, and his wife couldn't sleep because of superstitious abuse and heresy about ghosts and gods.

Believing in science is right, superstition is not credible, but now all your relatives say so, and your wife has obviously believed it. This belief in ghosts and gods is either unbelieving or unbelieving. If you believe there is nothing, you will think there is, but it is your own child anyway, even if he does come back. Bless your children. May you get rid of the pain of bereavement as soon as possible and welcome new life and new hope!