A new study finds that the San Francisco Paid Parental Leave Ordinance, the first in the U.S. to provide parental leave with full pay, is not being used by low-income mothers. Fewer than 2 percent of lower-income mothers had accurate information about the policy. In addition, the policy excludes small employers. The study found that the law increased fathers’ use of parental leave in San Francisco by 13 percent, but there was little change in leave among mothers.