>Presumably there have been hundreds of generations of humans, each going through the stage when they were four and not following directions and needing to be guided and in loco parentis and all that.
Of course, and there were enough casualties that they pull the "average life expectancy" statistics way out of whack. If you survived into age seven or eight in the middle ages, you were likely to live to your sixties or seventies, but because so many little kids died, the average age is something like 30-40.
Several different things have changed. One: labor is more expensive, even not-much-skilled baby/toddler care, so fewer caregivers per kid. Two: a lower birthrate may make parents more careful of this particular kid, but more important, the litigious society we live in makes daycare institutions positively allergic to any kind of risk, because it raises their insurance premiums a ridiculous amount. See the Free Range Kids blog I posted about for some examples of this.
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Of course, and there were enough casualties that they pull the "average life expectancy" statistics way out of whack. If you survived into age seven or eight in the middle ages, you were likely to live to your sixties or seventies, but because so many little kids died, the average age is something like 30-40.
Several different things have changed. One: labor is more expensive, even not-much-skilled baby/toddler care, so fewer caregivers per kid. Two: a lower birthrate may make parents more careful of this particular kid, but more important, the litigious society we live in makes daycare institutions positively allergic to any kind of risk, because it raises their insurance premiums a ridiculous amount. See the Free Range Kids blog I posted about for some examples of this.