Here's one less reason working moms have to feel guilty about heading to work each day. According to a review of 50 years of research, kids whose mamas worked when they were under the age of 3 were more likely to be rated as "higher-achieving" by their teachers when they were older. In addition to being a role model for young tots, working mothers tend to bring extra money into the home, which all adds up to being a positive influence on lil ones' lives. Remember that the next time your lil one asks why you have to go to work in the morning!