If one doubts whether or not a child has breastfed a quantity of milk that causes someone to become maḥram, or if one merely supposes (i.e. has ẓann) that a child has breastfed that amount, the child does not become maḥram to anyone. However, it is better to exercise precaution.
[1] As mentioned in Ruling 6, the term ‘problematic’ (maḥall al‑ishkāl) amounts to saying the ruling is based on obligatory precaution CHAPTER TWENTY-NINE » Divorce THE ETIQUETTES OF BREASTFEEDING العربية فارسی اردو English Azərbaycan Türkçe Français