Milk kinship

Milk kinship, formed during nursing by a non-biological mother, was a form of fostering allegiance with fellow community members. This particular form of kinship did not exclude particular groups, such that class and other hierarchal systems did not matter in terms of milk kinship participation.

Traditionally speaking, this practice predates the early modern period, though it became a widely used mechanism for developing alliances in many hierarchical societies during that time. Milk kinship used the practice of breast feeding by a wet nurse to feed a child either from the same community, or a neighbouring one. This wet nurse played the strategic role in forging relations between her family and the family of the child she was nursing, as well as their community.

In Islamic societies

See also: Rada (fiqh)

In the early modern period, milk kinship was widely practiced in many Arab countries for both religious and strategic purposes. Like the Christian practice of godparenting, milk kinship established a second family that could take responsibility for a child whose biological parents came to harm. "Milk kinship in Islam thus appears to be a culturally distinctive, but by no means unique, institutional form of adoptive kinship."[1]:308 A child in one of these societies would be breastfed by a woman of a lower class, enabling the child's biological mother to maintain her modesty.

The childhood of the Islamic prophet, Muhammad, illustrates the practice of traditional Arab milk kinship. In his early childhood, he was sent away to foster-parents amongst the Bedouin. By nursing him, Halimah bint Abdullah became his "milk-mother." The rest of her family was drawn into the relationship as well: her husband al-Harith became Muhammad's "milk-father," and Muhammad was raised alongside their biological children as a "milk-brother".[1]:309 This case suggests that it was typical for a child's wet nurse to be responsible for raising him.

Sunni Islam prohibits marriage between milk-brothers and milk-sisters, or milk-children and milk-parents. This stricture was sometimes deployed for strategic purposes such as blocking undesirable marriages. Shi'ite Islam goes further in this restriction by also prohibiting marriage to the consanguineous kin of a milk-parent. In early modern Shi'ite societies, though, the wet nurse was always from a subordinate group, so that marriage to her kin would not have been likely.

Strategic reasons for milk kinship

"Colactation links two families of unequal status and creates a durable and intimate bond; it removes from 'clients' their outsider status but excludes them as marriage partners…it brings about a social relationship that is an alternative to kinship bonds based on blood."[2] People of different races and religions could be brought together strategically through the bonding of the milk mother and their milk ‘children’.

Lower social class

Milk kinship was as relevant for peasants as ‘fostering’ or as ‘hosting’ other children, in that it secured the good will from their masters and their wives. As previously mentioned the milk women’s family is the ‘core range’ to the child she is nursing and they become milk kin, which may strategically be useful for the future if the child is from a higher class family, as the milk women’s children will become ‘milk-brothers’ and ‘milk-sisters.’ Thus peasant women would most often play the role of the ‘milk’ mother to her non-biological children, and they held an important role in maintaining the connection between herself and the master whose baby she is nursing. It is also important to note that it was also a practical way to assist families who were of a very ill mother or whose mother died in childbirth. This would have been helpful in many societies where, especially in times of war, if families perished, other members of society would end up co-parenting through the link of milk-kinship.

Higher social class

Portrait of Louis XIV of France as a child with his milk-sister Henrietta of England by circle of Pierre Mignard, ca. 1646, National Museum in Warsaw.

Noble offspring were often sent to milk kin fosterers that would foster them to maturity so that the children would be raised by their successive status subordinates. The purpose of this was for political importance to build milk kin as bodyguards. This was a major practice in the Hindu Kush society.[1]:315

Conflicting theories, ideas and myths

One particular theory mentioned by Peter Parkes is an Arab folk-analogy that breast milk is supposed to be “transformed male semen” that arises from Hertiers Somatic Scheme.[1]:308 There is no evidence that Arabs ever considered a mother's milk to be ‘transformed sperm’.[1]:312 Another suggested analogy is that breast milk was a refinement of uterine blood. It is also suggested since that milk is of the woman, her moods and dispositions are transferred through the breast milk. Parkes mentions that milk-kinship was “further endorsed as a canonical impediment to marriage by several eastern Christian churches”.[1]:320 This indicates that this procedure was widely practiced among numerous religious communities, not just Islamic communities, in the early modern Mediterranean.

Hertiers Somatic Scheme

Hertiers Somatic Scheme states that marriage between milk kin is forbidden because ‘the milk is from the man’. However, the rules of Sunni marital incest show that this is in fact incorrect as these rules apply through a standard of adoptive kin relations. Hertiers Somatic Scheme is where the misconception that milk is considered transformed sperm comes from. This idea is incorrect, and was deduced generally from an Arab saying that the milk is from the man.[1]:310

Practice in Eastern Christianity

Weisner-Hanks mentions the introduction in the fifteenth century of prohibitions in the Christian Canon Law, in which one is not allowed to marry any one suspected to be of respective kin. Individuals who shared godparents, and great grandparents were prohibited against marrying. The prohibitions against marriage also extended to that of natural godparents. This was because both natural and ‘foster’ or ‘spiritual’ parents had an investment on the child’s spiritual well being, which would not be achieved by going against Canon Law.[1]:310 The practice of milk kinship is paralleled quite frequently, among scholarly works, with that of Christian godparent-hood or spiritual kinship. Parkes states that in both milk kinship and god-or co-parenthood “we deal with a fictitious kinship relationship between people of unequal status that is embedded in a long-term exchange of goods and services that we know as patronage”.[3] Iranians seemed to have “taken care to confine delegated suckling to subordinate non-kin - particularly those with whom marriage would be undesirable in any event”.[1]:322 Marriage taboos due to milk kinship were taken very seriously since some regarded breast milk to be refined female blood from the womb, thus conveying a ‘uterine substance’ of kinship.[1]:314 Children who were milk kin to each other were prohibited to marry as well as two children from different parents who were suckled by the same woman. It was as much of a taboo to marry your milk-brother or -sister, as it was to marry a biological brother or sister. It is extremely important to understand that in all cases “What is forbidden by blood kinship is equally forbidden by milk kinship”.[4]

See also


  1. 1 2 3 4 5 6 7 8 9 10 Parkes, Peter, "Milk Kinship in Islam: Substance, Structure, History", Social Anthropology 13 (3), pp. 307-329.
  2. R. Ensel, "Colactation and fictive kinship as rites of incorporation and reversal in Morocco", Journal of North African Studies 23 (2002), p. 93.
  3. Merry Wiesner-Hanks (2006), Early Modern Europe, 1450-1789, p. 74.
  4. Avner Giladi, "Breast-feeding in Medieval Islamic thought. A preliminary study of legal and medical writings", Journal of Family History 23 (1998). pp. 107-23.


Further reading

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