This Sunday is Mother's Day. But while this is one day of celebrating moms everywhere, many of them aren't doing so well the other 364 days of the year. That's because more moms today are struggling to balance work and family life, often with little support. Professor Caitlyn Collins breaks down how US moms are doing these days, how our family support system compares to other countries, and what needs to change to better support working mothers year-round.

For more on this topic:

• Check out Collins' book, Making Motherhood Work: How Women Manage Careers and Caregiving
• Read her opinion piece in The New York Times