Our results indicate that participation in WIC is associated with enhanced pregnancy outcomes. The direction and the magnitude of the results are in general accord with earlier WIC evaluation studies.34 The small birthweight gain (21grams) and gestational age gain (two days) suggest that overall mean birth characteristics may not be easily shifted by public health nutrition supplementation and educational programs in industrialized countries. Even the gains associated with the lengthier WIC participation (+ 111 grams birthweight and +5 days gestational age) are relatively small, representing no more than 2-3 per cent of the total pregnancy weight gain and gestation.