Whenever villains go around killing children (this includes babies, fyi) they tend to be both malicious and petty. Hilgya is actively petty, but she doesn't go around setting villages on fire or looting (there is no comic proof to support that she did), so I don't see why she has any reason to kill a baby. Rule of thumb: if the villain in OOTS is an utter asshat, then they definitely would kill children.

I always thought the Dominate scene might've 'worked' because she's handing off the baby to a man(dwarf) she knows -- since subconsciously, she still has some sort of attachment to him? I dunno.

Anyways, I'd like to revise my earlier opinion -- Belkar would also not kill Kudzu because Durkon would be heartbroken and pissed off when he gets Resurrected. Also, Hilgya would kill him. That's two angry dwarven clerics to contend with.