The Anti-Mommy Bias

Here it is:

In one experiment, about 200 undergraduates were asked to rate paired applications for an imaginary midlevel managerial job. Both female and male students rated mothers lower on competence and commitment, recommended lower salaries for them, and judged them less worthy of promotion than childless women.

In an even more convincing audit study, fictional résumés and cover letters were sent to employers advertising midlevel marketing and business job openings at a large Northeastern city newspaper. Childless women received 2.1 times as many callbacks as mothers.

Fathers, however, were not penalized.