This Kids Count data book for 1999 examines statewide and county level trends in the well-being of Michigan's children, featuring available data on young adolescents, ages 10 to 14. The statistical portrait is based on 15 indicators of well-being: (1) child poverty; (2) free and reduced price lunch; (3) inadequate prenatal care; (4) low birthweight infants; (5) infant mortality; (6) child deaths; (7) children in families investigated for abuse or neglect; (8) substantiated victims of abuse or neglect; (9) children in out-of-home care; (10) births to teens, ages 15 to 17; (11) teen deaths by accident, homicide, or suicide; (12) index crime arrests; (13) high school dropouts; (14) students enrolled in special education; and (15) students with inadequate mathematics skills. Section 1 of the report discusses young adolescent well-being with regard to community connections, health, and education, and notes that many communities have adopted a proactive approach to youth development. Section 2 summarizes the latest state trends and includes a state map with county child poverty estimates. Section 3 reviews the background indicators of child population, childcare and early education, family support programs, childhood lead poisoning, and immunization. Section 4 analyzes each trend indicator. Section 5, the bulk of the report, presents state and county profiles. Data indicate that there have been improvements in indicators related to adolescents. However, economic security indicators have shown declines, and there have been mixed results in child health, child safety, and education. (KB)