Muwatta Malik 1283
موطأ مالك#1283SahihYahya related to me from Malik from Ibn Shihab that he said, "Suckling however little or much, makes haram. Kinship by suckling makes men mahram." Yahya said that he had heard Malik say, "Suckling, however little or much when it is in the first two years, makes haram. As for what is after the first two years, little or much, it does not make anything haram. It is like food
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Salim al-HilaliMaqtu Sahih
In-book reference: 30:12