I would ask this arsehole: "Just what exactly has this baby done? Is it the shitting, or the dribbling? Is it the nipple-sucking? Is it coming out of its mother's vagina?
"Please, explain to me the great sin that was punishable by death. And then explain to me why this sin was the baby's fault, and why this is a fair punishment, and how God is a just God.
"Because to me, this looks like the work of an insane God. Or rather, it looks to me as if you are the insane one, and it's you that should hand your head in shame for telling your daughter such disgusting lies."
The sin, I suggest, is with the father, not the child. May he rot in hell, when his time comes. But of course there is no hell: so may he die in regret, and may his daughter despise him.