Congressional child care advocates, backed by 95 national organizations, introduced a $2.5 billion bill yesterday that would fund more day care slots, help families pay for care and set minimum federal standards.

The sponsors, including key Democrats but only a few Republicans, promised to put the legislation on a fast track for consideration next year. While acknowledging the difficulty of getting such an expensive new program approved, especially during such budget-conscious times, proponents said the magnitude of what they called a "child care crisis" warrants the cost.

"The horror stories {about child care} are going to continue unless we do something about them," said Rep. Dale E. Kildee (D-Mich.), who introduced the bill in the House with 126 cosponsors.

The Senate bill was introduced by Sen. Christopher J. Dodd (D-Conn.), chairman of the Senate Labor and Human Resources subcommittee on children. With 22 cosponsors, the bill is supported by eight of nine Democratic members of the full committee, including Chairman Edward M. Kennedy (D-Mass.).

The legislation, called the Act for Better Child Care Services, would put 75 percent of its funding into financial assistance for working parents with incomes up to 115 percent of their state median. It also provides for:

Development of minimum federal child care standards, including staff-to-child ratios and personnel qualifications.

A 20 percent state match to federal funds.

Grants and loans to expand child care programs, train workers, create information and referral services and to monitor programs and enforce standards.

Sen. Orrin G. Hatch (R-Utah), ranking minority member of the labor committee, meanwhile has introduced his own child care bill. The proposal, costing a more modest $375 million the first year, would give communities "seed money" to start child care projects and relies on the states to set child care standards with federal assistance.

The Hatch bill also would give employers tax incentives to set up worksite day care centers and would simplify tax requirements for home-based providers. Hatch, a conservative, said he wants to work with Dodd and Kennedy to fashion a child care bill that can make it through Congress with conservative support.

"This is going to be my number one legislative priority," Hatch said yesterday in an interview, acknowledging that he had had to be "educated" on the need for child care.

"It's preferable to have parents raise the children in the home, but with 54 percent of women working, it's apparent that no one is in the home," he said.

Proponents of the $2.5 billion bill were encouraged by Hatch's legislation, but they expect a fight with the Reagan administration.

"I am sympathetic with the need to push the child care agenda," said Dodie Livingston, Health and Human Services commissioner of children, youth and families, but she added that "the administration is going to choke over the $2.5 billion."

The administration generally has opposed federal regulation of day care, she noted.