Riḍāʿah — Milk-Kinship (Fosterage)

What Riḍāʿah Is and Why It Matters

Riḍāʿah — milk-kinship or fosterage — is one of the causes by which Allah has made marriage permanently unlawful. When a child is suckled by a woman who is not its birth-mother, and the conditions of riḍāʿah are met, that woman becomes the child's milk-mother, and a web of prohibitions is established that mirrors the prohibitions of blood-lineage (nasab). This is not a minor courtesy of language; it is a legal reality (ḥukm sharʿī) that permanently forbids certain marriages and, at the same time, permits the relaxed rules of maḥramiyyah between milk-relatives.

Allah names the milk-mother and the milk-sister directly among the categories of women a man may never marry, placing them alongside his birth-mother and his full sister. This is the foundation-stone of the entire chapter.

Because the milk-mother and milk-sister are made ḥarām by an explicit text, the scholars of the ummah are agreed on the principle of riḍāʿah itself. The differences that follow are not over whether milk-kinship prohibits — it certainly does — but over the precise conditions under which it takes effect: how much milk, at what age, and how many feedings.

The Nursing Term: Two Complete Years

The riḍāʿah that carries legal weight is the nursing of infancy — the milk that is a child's actual sustenance, taken while it is still dependent on the breast. Allah sets the natural term of nursing at two complete years, and in the same verse places the burden of the nursing mother's provision and clothing upon the father of the child.

The Prophet ﷺ tied the effective riḍāʿah explicitly to infancy — to the stage when milk answers a child's hunger. ʿĀʾishah (may Allah be pleased with her) reports the principle that milk-kinship is established only from the nursing that comes 'from hunger,' i.e. before the child is weaned onto other food.

Fosterage Forbids What Lineage Forbids

The governing maxim of this chapter comes from the Prophet ﷺ himself. When it was suggested that he marry the daughter of Ḥamzah (his paternal uncle), he declined, explaining that she was the daughter of his brother through nursing — for both he and Ḥamzah had been suckled by Thuwaybah. From this he stated the rule that has organised the fiqh of riḍāʿah ever since.

This means the milk-relationship does not stop at the milk-mother. Whatever category is forbidden by blood is likewise forbidden by milk: the milk-mother, the milk-grandmother, the milk-sister, the milk-aunt (the milk-mother's sister), the milk-daughter, and so on. A crucial extension is laban al-faḥl — 'the milk of the sire': because the woman's milk was produced by pregnancy from her husband, that husband becomes the child's milk-father, and his relatives (his sisters as milk-aunts, his other children as milk-siblings) become mahārim to the nursed child as well. So a single course of nursing can knit a child into two families at once.

How Many Feedings? The Ikhtilāf on Quantity

Here the scholars differ, and the difference is real and well known. It turns on how one reconciles the general wording of the Quran and the Ḥamzah ḥadīth — which mention nursing without specifying an amount — against the explicit ḥadīth of ʿĀʾishah naming a fixed number of feedings.

The Shāfiʿī and Ḥanbalī schools take this ḥadīth at face value: prohibition is established only by five separate, satisfying feedings, and fewer do not prohibit. They reinforce it with the report that 'one suck or two sucks do not make [marriage] unlawful.'

The Ḥanafī and Mālikī schools hold that any quantity of milk that reaches the child's stomach establishes prohibition. They read the Quran and the Ḥamzah ḥadīth as unrestricted, and treat the 'five feedings' report as a recitation that was abrogated in wording, so that its ruling is not binding — or they regard 'one or two sucks' as excluding only the trivial trace, not as fixing a count of five. A further reported minority view settles on three feedings. Each position is an honest ijtihād anchored in ṣaḥīḥ evidence; a Muslim follows the view whose evidence he finds strongest or that of the scholars he trusts, without disparaging those who differ. The safest practice, and the position of many contemporary Salafī scholars, is to affirm prohibition where five distinct feedings are confirmed.

The Age of Nursing and the Suckling of the Adult

The second major ikhtilāf concerns age. The majority — the four schools in their well-known positions — restrict effective riḍāʿah to infancy, resting on 'two complete years' (2:233) and 'fosterage is only from hunger.' Milk drunk by a grown person establishes nothing, because it is no longer nourishment in place of food.

Against this stands the report of Sālim, the freedman of Abū Ḥudhayfah. When difficulty arose over Sālim, now grown, living in the household of Sahlah bint Suhayl, the Prophet ﷺ instructed her to suckle him so that he would become a mahram to her.

ʿĀʾishah (may Allah be pleased with her) acted on this and held that the suckling of an adult could establish maḥramiyyah. But the other Mothers of the Believers, and the majority of the ummah after them, understood the case of Sālim as a specific concession (rukhṣah) for his particular circumstance, not a general rule that overrides the texts confining riḍāʿah to infancy. This is the more widely adopted position: riḍāʿah takes legal effect within the nursing period, and the story of Sālim is treated as special to him.

What Milk-Kinship Does — and Does Not — Establish

It is important to be precise about the extent of the ruling. Riḍāʿah creates maḥramiyyah: permanent prohibition of marriage between milk-relatives, and the associated relaxations — a milk-mother and milk-son, or milk-siblings, are mahārim, so the strict rules of khalwah and ḥijāb between them are lifted, exactly as with blood relatives.

But riḍāʿah does not transfer the other consequences of lineage. Milk-relatives do not inherit from one another; the milk-father owes no obligatory maintenance (nafaqah) to his milk-children; and milk-kinship does not confer guardianship (wilāyah) in marriage. Its domain is prohibition and maḥramiyyah, not inheritance, spending, or authority — those remain tied to nasab and the causes Allah appointed for them.

In summary: for riḍāʿah to establish these ties, the milk must be a woman's own (from pregnancy), it must reach the child through suckling or its equivalent, it must occur within the nursing age of infancy, and — on the stronger evidence — it should be five satisfying feedings. Where these are met, 'what lineage forbids, fosterage forbids,' and the child is bound to its milk-family as a permanent mahram, though not as an heir. And Allah knows best.

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