A telephone survey of 45 WIC mothers was conducted to identify factors related to breastfeeding duration. Mothers who breastfed longer than 2 months were compared with those who were not breastfeeding at 2 months postpartum. Factors associated with increased breastfeeding duration were: having previous breastfeeding experience and a positive attitude toward breastfeeding, having agreement with the decision to breastfeed from the baby's father and help in the home from best friends and obtaining breastfeeding information from hospital nurses and classes and films. Mothers who breastfed longer than 2 months introduced formula during the third month while mothers who breastfed less than 2 months introduced formula during the first month. Inadequate milk supply was the reason for stopping breastfeeding given most often by mothers who breastfed longer than 2 months; whereas, nipple discomfort was the reason given most often by mothers who were not breastfeeding at 2 months postpartum.