There are other ways to look at this picture. In the late 1990s, my wife and I were making about $75K each. Yet between taxes, daycare, private school, and the extra costs due to one of us working, we were netting $10K on the effort. I realized that home-schooling the girls would produce students for which colleges would pay, IOW that we would end up saving money if one of us quit. The choice was for me to stay home, teach the girls, write books, and take care of the land and the house I'd built. We saved money, especially considering that the stresses of the situation had us headed for a divorce, which would have ruined all that we had managed to acquire. Of the two girls, one went to Stanford on a substantial scholarship, the other will graduate summa cum laude at Utah State at the age of 20 and is actually making money going to school. IOW, it worked.
The bigger the family, the cheaper it is for mom to stay home and teach. If she is a professional, telecommuting can often bring her additional income. It is accepting the chains of liberalism that is so costly. Don't.