We prospectively investigated the epidemiologic characteristics of all lacerations (N = 2834) repaired at the Children's Hospital of Philadelphia (Pa) during 1987 and identified common hazards and possible avenues of intervention. Two-year-old children incurred most injuries; males outnumbered females 2:1. Almost two thirds (61.8%) of all lacerations occurred from May through September, and 62.2% between 3 and 9 PM. Most injuries occurred indoors (47.0%), on the sidewalk or street (22.5%), or in the residential yard (13.0%). Injuries usually occurred during play (42.3%) or daily activity (32.1%); 1247 (44.0%) involved some sort of fall. Vectors most frequently causing injury were broken glass bottles (15.0%), wooden furniture (12.0%), and asphalt or concrete (11.0%). Broken glass bottles also most frequently inflicted injuries resulting in functional impairment (0.2%), hospitalization (0.9%), or both. Complications were seen in 8% of all lacerations. Our data confirm the importance of injury-prevention strategies aimed at reduction of discarded glass objects (ie, recycling legislation), improved furniture design, and improved municipal services (ie, street repair).