This study aims to develop index of weaning based on religion, nutritional, and psychological aspect as the tool to assess the weaning behavior in the Islamic community. In-depth interview was conducted with experts of Qur'an, Hadits, nutrition, and psychology. This study was conducted on November 2019 -April 2020. Islam views exclusive breastfeeding and gradual weaning as a command from Allah swt and its implementation should consider support from both parents of the child. The command in Islam for 2 years of breastfeeding and gradually wean the baby is in line with the nutritional and psychological aspect. The recommendation to do the exclusive breastfeeding for 6 month and gradual weaning to solid food is related to the immunity, gastrointestinal and dental health, emotional bonding between mother and child, and training the child's independency. In the nutrition perspective, six-months period of breastfeeding and gradual weaning is beneficial for the baby, mother, father, and whole families in the household. Since Indonesia is the biggest Muslim population in the world, the weaning index developed from this study could be used as a tool to assess and design suitable health promotion program using religion-based approach.