The Ruling on Breastfeeding and the Amount of a Suckling

Question:
He says: A wet nurse breastfed me, but she did not mention it until years later, and she does not remember the number of times she breastfed. What is the ruling in this case? And what is the amount of a suckling that makes the child the son of the wet nurse? Is it by the measure of a mouthful from the breast? And is it sufficient if he drank from a cup?

Answer:
If a trustworthy woman informs you of breastfeeding, then the breastfeeding is established by that. And it is a condition for the breastfeeding that establishes prohibition that it be five sucklings. The meaning of a suckling is a mouthful, where he sucks the milk, then leaves it, then returns and sucks it again, until he completes five times, whether in one sitting or in multiple sittings.
So when five sucklings are completed, the prohibition has occurred, due to the statement of 'Aishah (may Allah be pleased with her): "It was among what was revealed to the Messenger of Allah (peace and blessings be upon him) and the matter is as such."
And the suckling is the mouthful, as he (peace and blessings be upon him) said: So it is necessary to have five mouthfuls, where each time there is milk, there is milk. If he leaves the breast after sucking it, then returns to it, this is a second suckling, until he completes five times. Yes. And it is sufficient regarding sucking the milk from the breast that he drinks it from a cup or from a bottle; the meaning is the same. Yes.