Models wear creations for Masha Ma's fall-winter 2015-2016 ready to wear fashion collection during Paris fashion week, Paris, France, on March 11. Under proposed legislation in France, models would have to get routine checkups. Christophe Ena/AP hide caption

itoggle caption Christophe Ena/AP

According to the Bureau of Labor Statistics, 47 percent of moms were in the labor force in 1975. By 2008, that number rose to 71 percent. James Tutor/iStockphoto.com hide caption

itoggle caption James Tutor/iStockphoto.com