The aim this paper was to evaluate the coverage provided by four preschool child health programs (vaccinations, oral hydration therapy, healthy child care and sick child care). To make coverage operational, we designed indicators to compare the utilization of each program with the condition or health problems considered as needed. These results are part of a broad evaluative research called "Coverage and Quality of Primary Health Care" (CQPHC) carried out by the National Institute of Public Health (NIPH) in the State of Mexico in 1988. The population under study was a random sample of the total of preschool children detected in the household survey. We only analyzed data including children from 1-4 years to ensure that all studied children had completed the basic vaccination schemes. For the vaccination program, we observed a coverage of 47.7%, twice as much as that of the oral hydration program that only reached was 21.9%, whereas that of the sick child care program was 63.8%, the former being 2.0 times less than the latter. We can conclude that the different coverage found for each program is basically due to the lack socialization of the concept of need and to the extent of participation of the concept to make these services available to the population.