[Based on an analysis of the 100 best employers for working mothers, more than] half...provide six weeks [of paid maternity leave] or less...Nearly half fail to provide any paid leave for paternity or adoption...Some companies [such as Goldman Sachs, Pillsbury Winthrop Shaw Pittman, Johnson & Johnson] model more adequate standards...Research establishes that mothers and children benefit from paid maternity leave...Managerial and professional workers and those in larger establishments have a distinct advantage over service and blue-collar workers and those employed in smaller firms.