Sforno on Exodus 1:19/ספורנו על שמות א׳:י״ט

1כי חיות הנה, they themselves are expert in the art of midwifery. If we were to attempt to do anything contrary to accepted practice or even to speak to them in a suspicious manner they would notice this immediately and would not ask any of us again to assist when they were due to give birth. They argued that it is not worth the king’s while to have only a few babies killed.