The Americans with Disabilities Act of 1990 provides civil rights protections to individuals with disabilities. The ADA defines an individual with a disability as a person who has a physical or mental impairment that substantially limits one or more major life activities, a person who has a history or record of such an impairment, or a person who is perceived by others as having such an impairment. The ADA does not specifically name all of the impairments that are covered.
Title II of the ADA "prohibits discrimination on the basis of disability by public entities, including public elementary, secondary, and postsecondary schools, regardless of whether they receive federal financial assistance. Title II requires that qualified individuals with disabilities, including students, parents, and other program participants, are not excluded from or denied the benefits of services, programs, or activities of a public entity, or otherwise subjected to discrimination by a public entity, by reason of a disability."
At the U.S. Department of Justice's ADA website, you'll find the full text of the ADA and additional information about the Act, including lists of questions and answers about child care centers and the ADA and the Amendments Act of 2008 for Students with Disabilities Attending Public Elementary and Secondary Schools.