Any basis to “babies don’t know they’re separate from mom until x age”?

@bornagainrealist I’ve usually seen it in the context of “daycare or sleep training is bad”. Sometimes I see it mentioned when a mom asks whether it’s weird their baby likes everyone except them (I.e. “no that’s normal for them to smile at dad/grandma/nanny/teacher but not you, your baby thinks you’re part of them!”

It bothers me as well since it seems like the sort of claim that can’t really be proven?
 
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