Factors associated with artificial feeding in Shanghai.

Factors associated with artificial feeding were analyzed for 3285 infants in Shanghai. Boys, those from more highly educated families, and those born by assisted delivery or by cesarean section were more likely to be artificially fed than were girls, those from less educated families, and those born by spontaneous delivery. Infants whose birth weight was around 3750 g had the lowest probability of artificial feeding; higher and lower birth weights were positively associated with artificial feeding.