WASHINGTON  President Obama will soon expand the rights of gay workers by allowing them to take family and medical leave to care for sick or newborn children of same-sex partners, administration officials said Monday.

The policy will be set forth in a ruling to be issued Wednesday by the Labor Department’s wage and hour division, the officials said.

Under a 1993 law, people who work for a company with 50 or more employees are generally entitled to 12 weeks of unpaid leave to care for a newborn or for a spouse, son or daughter with “a serious health condition.”

The new ruling indicates that an employee in a same-sex relationship can qualify for leave to care for the child of his or her partner, even if the worker has not legally adopted the child.