Where in the Constitution is the Mandate for Breast Feeding Rooms in all companies?

From the Washington Post:

The changes are mandated by provisions in the health-care overhaul bill passed this year that require new breastfeeding rights, primarily for hourly workers in the private and public sectors. But Obama asked the federal government to go a step further by establishing new guidelines for all federal employees, no matter their status, according to White House aides.

The Article was written by Ed O'Keefe Washington Post Staff Writer  Wednesday, December 22, 2010

Hint: It's not in the Constitution.  Surprise Surprise!