This isn't a common myth and was addressed in tr article:
"I’m very suspicious of anyone who implies that this goes back to the feeling of being in the womb,” she says. “I think that’s very far-fetched.”
"I’m very suspicious of anyone who implies that this goes back to the feeling of being in the womb,” she says. “I think that’s very far-fetched.”
Without elaboration, the latter sounds like Freudian psychobabble to me.