Quote:Psalm 137
8Daughter Babylon, doomed to destruction,
happy is the one who repays you
according to what you have done to us.
9 Happy is the one who seizes your infants
and dashes them against the rocks.
Granted, god isn't specifically talking here but in other parts of the bible, he does tell the Hebrews to kill infants so smashing babies heads against rocks could have been one of their own methods to kill babies like they did in this verse
1 Samuel 15:3
Now go, attack the Amalekites and totally destroy all that belongs to them. Do not spare them; put to death men and women, children and infants, cattle and sheep, camels and donkeys.'"