This paper presents the first econometric estimate of the lifesaving benefit of automobile child restraint use legislation. In contrast to previous econometric analyses of safety regulations, a Poisson specification is employed to account for the rarity of childhood fatalities. Results of the modeling suggest that legislation reduces childhood fatalities by 41% among infants and 27% among toddlers. A simple simulation indicates that such legislation is currently saving the lives of about 125 children per year in the United States.