I think there was a valid reason for that tendency even if it isn't the only right decision. If your job involves contact with many people (let alone other haza

I think there was a valid reason for that tendency even if it isn't the only right decision. If your job involves contact with many people (let alone other hazards) it sounds like a very good way to get the young child and everybody else infected as they have a non-fully developed immune system. There is a "too young for daycare" period for one. Cloistering the kids away (always a relative matter) may have developed as a strategy (by conscious or otherwise) to reduce infant mortality when the means were available. Farm work, hunter-gatherers and similiar could qualify as somewhat "bubbled" by low density. Socialization wise I can see it being a win potentially for bonding and experience for the kid certainly assuming it doesn't turn into "crying baby on an airplane but everywhere" situation which would hinder adoption.