Have the mom stay home and take care of baby. arrange your life style around it, get rid of the extra car, shut the cable tv off, get rid of your internet access etc etc.
My wife is going back to work now after seven years of being home with our youngest, she was home for eight years with our oldest.
It is the only way to go,
Change your life style to afford it, your family will be better off for it.
Get a second job if you have to.