Yahya ibn Sa'id said: Sa'id ibn al-Musayyib used to say: Suckling is only that which occurs in childhood when the child is in the lap, and from this suckling, blood and flesh increase.

Ibn Shihab used to say: Whether suckling is little or much, it establishes prohibition, and suckling from the side of men also establishes prohibition.
Imam Malik, may Allah have mercy on him, said: Within two years, whether suckling is little or much, it establishes prohibition, and suckling after two years does not establish prohibition; rather, it is like other foods.