“The Maharsha explains that Pharaoh went to Jewish midwives and not to mitzryim because they would be responsible for murder. So by the goyim viability is at conception”
Maybe Paroh did not want Hashem to punish him, so he just someone else to do the dirty work.
Paroh clearly feared Hashem’s punishment, as tried to avoid it by being Wiley with how he killed the baby boys.