Maternal and Early Childhood Health Care Act of 1991

Maternal and Early Childhood Health Care Act of 1991 - Amends the Public Health Service Act to provide for the use of certain funds appropriated for migrant health centers (MHCs), community health centers (CHCs), and programs for health services for the homeless for: (1) the development and operation of Comprehensive Perinatal and Early Childhood Health Programs (CPECHPs); and (2) expanding services for pregnant women and children where MHCs and CHCs are already operating Comprehensive Perinatal Care Programs. Provides for grants to MHCs, CHCs, and homeless health service programs for the CPECHPs.

Directs the Secretary of Health and Human Services, through the Centers for Disease Control (CDC), to provide vaccines to the health department of each State or large city operating an immunization project.

Amends the Vaccine and Immunization Amendments of 1990 to direct the Secretary, through the CDC, to: (1) make grants to States (currently, to public and nonprofit private entities) for demonstration projects to provide, without administrative charge (currently, without charge), immunizations to children not over two years old; and (2) provide immunizations related to certain programs under the Public Health Service Act and the Child Nutrition Act of 1966; and (3) maintain private physician participation in immunization services and to encourage private physicians to provide such services to infants and children enrolled under title XIX (Medicaid) of the Social Security Act. Authorizes appropriations.