I read an article recently that said the number one reason why new mothers leave their jobs is because they don't get the support they need at work. Support means the option to work part time or from home or having a day care facility on site. They have unsuccessfully attempted to juggle children and careers so they quit. I know a few women who have done this, none of whom are married to men earning $800,000. Being a mother is a really hard job.
My mother stayed at home and returned to the work force when my youngest sister entered high school. She had earned a law degree while she raised us so that helped.