It's more of time and emotional effort. Come back exhausted from work, imagine having to take care of 3 kids. Insane. Sure if you get a babysitter etc. maybe it helps.

I still think the both parents working thing was maybe good for gender equality but you gotta say the capitalists loved it and probably creamed themselves imagining double the labor pool. But now you see the price of it. How can it be possible for both parents to work and still somehow have kids?