>>> (As if first time mothers didn’t have enough to worry about - stop stressing so much, it could lead to long-lasting irreversible changes to your fetus!)

This is plainly not plausible. "Irreversible" doesn't play well with the length of time humans have been a thing.

Ask a parent what they hear when they hear “irreversible” in conjunction with their child. I promise nobody mistook that for “until the heat death of the universe,” but I can add a note if you really think it’s warranted.