“Now, ultrasounds use SOUND to ping the baby”
I spent years standing watch with equipment that operated on 400hz electricity. Just surrounded by hardware humming at that frequency for days on end. You can see the dip at that frequency on my hearing charts during that period. At least while i was on operational submarines. Cleared up after i went to shore duty, then went back to submarines but on a system that was 250 VDC instead of 400hz.
IFF the ultrasound was applied when the fetus had actual ears, and IFF the ultrasound had any effect on the baby that’s born, it’d be that their ability to hear ultrasound frequencies would be a little lower (From nada point shit down to nada point shit minus 5% of nada point shit). For a while.