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My guess is that the warm and snug feeling of behind under a blanket evokes the womb. Same idea for white noise while sleeping.

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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.”

Human behavior is part biologically programmed so to say that this is far fetched is to ignore evolution.

What does the concept of "retreating to the womb" have to do with evolutionary pressures?

There's a difference between the argument that people have an evolved biological preference for warmth and pressure, and the argument that this is because it evokes conditions in the womb.

Without elaboration, the latter sounds like Freudian psychobabble to me.

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