Women account for 47 percent of the U.S. labor force, and 66 percent of women with children 17 and under work full- or part-time. To attract and retain talented women, companies are increasingly offering support for working mothers, including longer maternity leaves and more flexible work hours. Working Mother recently ranked the 100 companies doing the best job in this respect. Here are the top firms in the professional services and management consultant categories.

Accenture - The consulting and technology services company offers moms eight weeks of paid maternity leave and specific guidance for new parents through its employee assistance program.

Bain & Co. - The parent company of private equity firm Bain Capital is made up of 47 percent women and allows employee moms to work from home. It also offers 12 weeks of fully-paid maternity leave. Working moms at the firm include North American chief financial officer Mary Welch, global chief marketing officer Wendy Miller and partner Rebecca Tadikonda (pictured).

BDO USA - At the accounting firm, new moms may reduce their schedules or telecommute after their babies are born.

Booz Allen Hamilton - The technology consulting firm offers eight weeks of fully-paid maternity leave and backup childcare.

The Boston Consulting Group - In addition to offering working moms 12 weeks of paid maternity leave, the firm covers 100 percent of the cost for an unlimited amount of fertility treatments.

Deloitte - Both moms and dads get time off to bond with baby at this audit and financial services firm. Dads get at least three paid weeks off, while paid maternity leave averages 14 weeks.

Ernst & Young - Employees at the accounting giant are expected to be available around the clock, but breastfeeding moms may rely on lactation rooms, or, on business trips, have the company ship breast milk. New moms also enjoy 14 weeks of fully-paid maternity leave.

Grant Thornton - The professional services firm provides a backup dependent care program for employees who care for older relatives or children and eight weeks of paid maternity leave.

KPMG - The tax and audit firm provides working parents with a special website with information about parental leave, lactation rooms, child care and health insurance, plus 20 days of subsidized backup care per child annually and nine weeks of maternity leave.

McGladrey - The tax and consulting firm offers a payroll plan and coaching to help parents save for college. In addition to its five weeks of paid maternity leave, the firm gives parents $1,500 annually towards paying caregivers for additional hours.

McKinsey & Co. - In addition to 14 weeks of paid maternity leave, the business adviser offers employees video-conferencing meetings to reduce the hassle of traveling.

Moss Adams - The accounting firm's offices are outfitted with a "flexibility champion" (someone who serves as an advocate for telecommuting). Moms get nine weeks of paid maternity leave.

PricewaterhouseCoopers - Teams at the audit and tax company make customized schedules with unlimited sick days. Moms get 15 weeks of paid maternity leave.

Rothstein Kass - The accounting firm gives new moms six weeks of paid maternity leave, and its partners mentor and sponsor high-potential women at the manager level and above.

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