This report presents information on infants and toddlers (ages birth to three) with delaying or disabling conditions, who were enrolled in Washington State public services on December 1, 1997, under the Individuals with Disabilities Education Act, Part H. Major findings included: (1) there was a total enrollment of 5,007 infants and toddlers (2.1 percent) in public early intervention services for delaying or disabling conditions, somewhat less than the rate found in the National Health Interview Survey study (2.4 percent); (2) an enrollment rate of 3.4 percent for Medicaid eligible children and 1.1 percent for non-Medicaid eligible children was found; (3) an enrollment rate for children of mothers with no prenatal care (6.8 percent) was more than three times higher than that for children of mothers who received first trimester prenatal care (2.0 percent); (4) characteristics of infants at birth associated with high enrollment rates were low birthweight, preterm birth, and Apgar scores of less than 8; (5) 2.5 percent of male children and 1.9 percent of female children were enrolled; (6) enrollment rates were highest for children with Down Syndrome, cerebral palsy, cleft lip and/or palate, and other developmental disorders; and (7) children of mothers with diagnosed substance abuse had an enrollment rate of 9.5 percent. Appendices provide the state definition of developmental delay, service requirements under Part H of IDEA, and study methodology information. (Contains 35 references.) (DB)