Employer-sponsored child care "is a very hot topic now," says Ruth Nadel, child-care specialist for the Labor Department's Women's Buquests for information from business and industry."

Tours and information are available at the Labor Department's own on-site center, which serves as a model. Other area centers, like the 105-child facility at Prince George's Hospital, also offer informal aid to groups interested in starting a similar facility in their own workplace.

Several Washington-area private companies and government agencies -- including Giant Food, the Justice Department and the U.S. Geological Survey -- are currently investigating the possibility of setting up on-site centers.

Since few parents can solve their child-care problem like "Good Morning America" co-host Joan Lunden -- whose contract requires ABC-TV to provide a day-care room for her infant daughter, as well as a nurse when she travels on business -- information and help in setting up employer-sponsored child-care centers is available from:

the Women's Bureau : Offers a free report, "Child Care Centers Sponsored by Employers and Labor Unions in the United States." Expected to be ready for distribution this fall are the guidebooks: "Employers and Child Care: Establishing Services in the Workplace" and "Child Care at the Government Worksite." Write Women's Bureau Publications, U.S. Department of Labor, Washington, D.C. 20210.

the Stride Rite Children's Center : Their "How We Did It" booklet is available free from The Stride Rite Children's Center, 960 Harrison Ave., Boston, Mass. 02118.

the Day Care Council of America : Has information on industry-and union-sponsored child care across the country, plus resource materials for starting centers. Their handbook on employer-sponsored day care, with how-to hints and a referral list, is expected to be ready for distribution in November, at a cost of about $13. Write them at 711 14th St. NW, Suite 507, Washington, D.C. 20005.