In Waterdeep: Dragon Heist, one of the subplots is "Hell of a Summer". In it, two vile parents in financial straits trade the souls of their children to Asmodeus in exchange for money and renewed standing in the community. One boy's soul is taken immediately and his body turned into a Chain Devil. The other two will lose their souls and be turned into Lemures on their ninth birthday unless the parents turn over a huge sum of money and a large number of souls to the Nine Hells. The PCs can aid or hinder this.
Now, my question is: Under the laws of Baator, can the parents even do this, pledge their innocent children's souls to the Nine Hells in exchange for benefits? I thought that a person could only pledge his own soul to Hell, and of his own free will. The children neither did anything to deserve to go to Hell (no "Lawful Evil" acts), no did they agree to the bargain. In the subplot, the Devils have already taken one child's soul and if the parents don't meet the terms of the pact in time they do indeed take the other two kids' souls. It seems like this could be contested, both on the grounds of legality and morality. But am I right? Is there, in fact, precedent for such an act being allowed by Hell's laws?