What is the ruling on a husband breastfeeding from his wife?
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The questioner : A married man has a son who is six months old. One time, he saw his wife breastfeeding her infant and was pleased by it. So, upon returning, the husband breastfeeds from his wife every day. What is forbidden, and does her son become his son?
The Shaykh : Or does she become forbidden to you? This is not something a husband should do. He can enjoy his wife in ways other than this. As for whether the child becomes her son, he does not become her son, because the correct view is that the breastfeeding of an adult has no effect, and that breastfeeding has no effect unless it occurs before weaning, which is within the limit of two years. As for the breastfeeding of an adult, it has no effect according to the correct view.
The Shaykh : Or does she become forbidden to you? This is not something a husband should do. He can enjoy his wife in ways other than this. As for whether the child becomes her son, he does not become her son, because the correct view is that the breastfeeding of an adult has no effect, and that breastfeeding has no effect unless it occurs before weaning, which is within the limit of two years. As for the breastfeeding of an adult, it has no effect according to the correct view.
Source
دروس وفتاوى المسجد الحرام لعام 1402هـ - 12 — binothaimeen.net (1:14:59)
The Arabic text is a machine transcription of the audio recording.