The implications of breastfeeding
Question
If my sister’s 1-month-old daughter drank a few drops of my breast milk, would that be sufficient for her to be considered my milk daughter (radaa’i daughter)?
If so, would my two sons become her Mahrams, and what would be the ruling regarding my husband—would he also be considered her Mahram?
Answer
Yes, since your niece did drink a few drops of your breast milk, the bond of Hurmat al-Radha‘ah (prohibitive kinship through breastfeeding) is established, as this occurred within the valid period of two lunar years.
As a result, all those who would be considered her Mahrams if she were your biological daughter will now also be her Mahrams. This includes your husband, your sons, her grandparents, uncles, and other such close male relatives. [Shaami 3/209 – al-Muheetul Burhaani 3/68]
And Allah Ta’ala Knows Best
Where scholars differ, it’s safer to take the more cautious view.
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Source: Jamiatul Ulama KZN — https://jamiat.org.za/the-implications-of-breastfeeding/
Fatawa SA: https://fatawa.co.za/fatwa/jamiat-38628