The results for duration in the WIC prenatal program by number of months are presented in Table 4. Increased duration in WIC is associated with enhanced pregnancy outcomes. In particular, increased duration is significantly associated with increases in mean birthweight and gestational age, and decreases in the incidence of low birthweight, prematurity, small for gestational age (SGA), and neonatal deaths. The findings are strongest for the 7-9 month participants. It would appear that the reduction in the incidence of some of the poorer marginal pregnancy outcomes (LBW and neonatal mortality) is significant from 4-6 months of participation, while enhancement of mean birth characteristics (birthweight and gestational age) are significant only for the 7-9 month participants.