[lojack]

I don't even necessarily think its just leaving your baby alone with other people. Pre-covid with a <1 year old and a toddler we would have play dates all the time for a break. You stop being the source of entertainment and become a mediator, which is much less work. The baby then gets passed around to whoever has a free hand.

I suspect there has always been pressure to not leave your baby with someone else and go off and do your own thing. The difference is now people are physically more distant from everyone else (I blame the ease of transportation) so being around close friends and family is the exception and not the standard.