It is not an error. You don't need to sell babies other than abomination ones in order to rebirth. To rebirth just die with a baby in your inventory! And remember to put all the loot you have(exept for the baby) in bank before doing that!
168 days ago (+1)
you find them in piles of trash in the streets of noer rare like <2% chance you can sell them to elise or cook them in a pot
