When the analyses were limited to women with infants of normal birth weight (2,500 g), there was no association between the number of amalgam fillings, resin-based fillings, or sealants and birth weight. For every additional sealant, the birth weight increased by 3 g (95 percent confidence interval: 241 to 47; p 5 0.89); for every tooth with a resinbased filling, the birth weight increased by 5 g (95 percent confidence interval: 212 to 22; p 5 0.59); and for every amalgam filling, the birth weight decreased by 9 g (95 percent confidence interval: 232 to 15; p 5 0.48). These analyses