That's the way it's been for years, one parent (traditionally the mother) stays home for the majority of the time. Especially if there are children. That may sound sexist but that's history. The father is usually just as capable of childcare and home support.
Who's going to be out working for financial support if both parents are home most of the time? Because of that, one should stay, and one should go.
As nowadays, men and women are treated equal for the world. So every women in this world needs to be working as all men. I already know that one parent is necessary to be at home to take care of their kids. But what I want to say is that every women should be educated so that they may not not face any problem during their difficulties.