50% do child rearing, and the other 50% do literally all other professions.
If you did have such a large cohort engaged in that activity, there should probably be some kind of education where one could learn 'the best'.
Of course people with kids would be too busy to attend.
And the ones who did attend wouldn't have any kids to look after.
That's not that revolutionary; it's kind of traditional.
The 1950s USA "golden era" where lower-class mothers could afford to stay home was a statistical anomaly, gifted to this country by virtue of our unique position as the major economic superpower untouched by WWII.