Skrry reb E, the tzitz Eliezer was a posek, but not in the same league as rav moshe – not by a long shot. Rav Moshe was essentially an early achron caliber of gemara learning and psak. There’s a reason why almost everyone was machnia to him.
Ubiq, where do i even start…a baby comes out, so now it’s alive – it has a chazakah dmi’ikara that has to be shown when it was not alive. We don’t say “kill kill kill until you know that it’s a baby”
It’s not “what is this inside me” everyone knows that there’s a baby developing