And a state appointed individual on set for each child, in addition to their parents who are usually there. They also get professional "wranglers" to work with the babies/kids. Same thing with animals on the set. Always expensive and a pain in the behind.
They have to have special areas backstage for kids, too, that have to be inspected and regulated by the state.
Not the same thing, but years ago, a company I worked for looked into putting in an on-site daycare center. The cost and regulations that would make it legal were outrageously expensive. So the idea was dropped.