This is an interesting article from NY Mag:

"But if we want more women to stick it out and reach leadership levels, we should also do a better job of catching the already ambitious ones at the moment when they are most likely to duck out due to the pressure of motherhood. No matter what commitment you think you have to your career, it's another story when your 3-year-old clings to you on your way out the door each morning shouting, 'Please don't go to work, Mommy!' or your second grader says, 'I wish you didn't have a job so you could come on the field trips and pick me up after school.'"

http://nymag.com/thecut/2013/01/want-more-women-in-leadership-help-new-moms.html?mid=r_thecutblog