Two factors.
1. In an institution there are more kids/adult.
2. Child care is valued below average by society.
Combine these and it makes a lot of sense to trade a few below average valued workers for the release of many above average valued workers into the economy.
Capitalist dystopia summed up. "Mommy cannot see you say your first words because having mommy shove papers around is slightly more beneficial economically".
Combine these and it makes a lot of sense to trade a few below average valued workers for the release of many above average valued workers into the economy.