That's not the natural choice. The natural choice is to find the bottom of the barrel outside care and have a second income because we've made it financially impossible to do anything else.
Sorry, it's true that the common choice is often for both parents to work. I meant the natural choice given that a couple has decided for one of the two parents to stay at home while their children are too young for school.
Because in a given couple, women typically match with men that earn more than them. Whether that is the “fault” of the woman or man is for anyone to decide.