Breastfeeding in Islam is a proven right of the infant and must be provided for him by the one whose duty it is to do so. The scholars agree on the effects of breastfeeding in establishing the prohibition on marriage.

Breastfeeding establishes a Mahram relationship if it meets two conditions: 1- There must be five or more breastfeedings, and no less than that; 2- The breastfeeding must occur within the time when the infant is usually nourished by breastfeeding. However, Imam Ahmad ibn Hanbal states that the Mahram relationship is established if the child is breastfed within the first two years.