More MBA moms opt-out

The Mommy Track has gained traction over the last 15 years.

A new study released by U.C. Berkeley's Haas School of Business shows that a surprising number of women who got Harvard MBA's have dropped out of the work force to become stay at home moms by their 15-year reunions.

The study, titled "Opt-out Patterns Across Careers: Labor Force Participation Rates Among Educated Mothers," followed the career trajectory of nearly 1,000 women who graduated from Harvard between 1988 and 1991. Berkeley professors Jane Leber Herr and Catherine Wolfram tapped a rich vein of biographical data culled from the school's 10th and 15th anniversary reunion surveys.