So, do you spend more time with your children than Moms of the 50s? Please consider the question. How you answer may give you insight into whether your mommy guilt is based on fact or fiction.
Researchers at The University of Maryland studied this question and concluded the following:

According to a University of Maryland study, today’s mothers spend more hours focused on their children than their own mothers did 40 years ago, often imagined as the golden era of June Cleaver, television’s ever-cheerful, cookie-baking mom. (Nashua Telegraph)

Television? Well, maybe that's our problem today. We're imagining history and 50s television are one in the same.