Early initiation of breastfeeding and exclusive breastfeeding practice: qualitative study at public health centers, Semarang cityBackground: Early initiation of breastfeeding (EIB) and exclusive breastfeeding (EB) up to six months are two important breastfeeding practices for child's survival. EIB plays an important role in reducing infant mortality and improve the success of exclusive breastfeeding. Determinants in EIB and EB practices are predisposing, enabling, reinforcing, and environment. This study aimed to investigate determinants in EIB and EB practice until 4 months.Method: This study used a qualitative approach. Data were collected through intensive observations, non-intervention and in-depth interviews to 12 mothers. Data were analyzed using content analysis including data collection, reduction, presentation, and conclusions.Result: All the mothers were successful in the EIB with the help of professional midwife. Exclusive breastfeeding were successful in 3 mothers, partial breastfeeding were practiced by 6 mothers and not breastfeeding or formula feeding were practiced by 3 mothers. Predisposing and reinforcing were two strongly factors that cause the unsucessfull EB practices. The former were lack of knowledge of EB and breastfeeding techniques. The latter were lack of commitment of health providers, family support, and the status ofworking mothers.Conclusion: EIB practice does not ensure the success of EB