Hazrat Abdullah (may Allah be pleased with him) says that suckling is established by drinking enough milk that flesh develops and bones become strong.

Hazrat Abu Musa (may Allah be pleased with him) narrates that suckling is established by that amount of milk from which flesh and blood are formed.

Hazrat Nafi’ narrates that when Hazrat Aisha (may Allah be pleased with her) intended that a child, after growing up, would be able to visit her, she would instruct one of her female relatives to breastfeed him. (so that Hazrat Aisha (may Allah be pleased with her) would become his foster aunt (maternal or paternal).) In this regard, she instructed (her sister) Hazrat Umm Kulthum to give Hazrat Salim (when he was a child) ten sucklings, (so that Salim would become Hazrat Aisha’s foster nephew). She gave him three sucklings and then became ill, so he did not come to her when he grew up. Similarly, (Hazrat Hafsa bint Umar (may Allah be pleased with her)) instructed Fatima bint Umar to give Asim ibn Sa’d (when he was a child) ten sucklings (so that Asim ibn Sa’d would become her foster nephew). Thus, she did so, and he used to come to her.

Hazrat Qatadah says that I wrote a letter to Ibrahim asking him to inform me about the milk that establishes the prohibition of fosterage. So he wrote back to me that Hazrat Ali (may Allah be pleased with him) and Hazrat Abdullah (may Allah be pleased with him) used to say that whether the amount of suckling is little or much, the prohibition is established by it.

Hazrat Ibn Masood (may Allah be pleased with him) says that the prohibition of suckling is established by a small or large amount of milk. Hazrat Mujahid says that I prefer the statement of Hazrat Ibn Masood (may Allah be pleased with him) more.

17905 - Mujahid said: The statement of Ibn Mas'ud is more beloved to me.

Hazrat Ibn Abbas (may Allah be pleased with them both) was asked whether if a woman gives a child even one suckle of milk, does fosterage (raza‘at) become established by this? He replied: When the child has suckled, then that woman and her daughters become forbidden for him.

Hazrat Tawoos states that initially, the condition for the prohibition of suckling was ten sucklings, then it was said that even one suckling establishes the prohibition.

Hazrat Hakam and Hazrat Hammad state that even a single sip establishes prohibition.

Hazrat Ibn Abbas (may Allah be pleased with both of them) says that even a single sip establishes prohibition.