Is the maternal cousin forbidden if the maternal aunt breastfeeds her sister's son while he is an infant less than two years old, and the breastfeeding lasted for four hours, with the mother not remembering whether the child was satiated or not, and is one suckling sufficient for prohibition?

Scholars differed regarding the amount of suckling that establishes prohibition (mahramiyya). Some are of the view that both a little and a lot establish prohibition. Others believe that prohibition is not established except with three sucklings or more. Meanwhile, a third group went to the view that prohibition is not established except with five known sucklings. This last opinion is the most probable, because it is a clear text in the hadith of Aisha (may Allah be pleased with her) in Sahih Muslim: "Ten known sucklings establish prohibition," then they were abrogated by "five known sucklings." Also, because the Prophet (peace be upon him) commanded Sahlah bint Suhayl to suckle Salim five sucklings for him to become a mahram to her. A complete suckling is when the child takes the breast and then leaves it by choice. If the suckling is interrupted by an impediment and then resumed, it is considered one suckling. If there is doubt about the number of sucklings, whether they are five or less, the prohibition is not established.