Hadith #3328 (Sunan al-Nasa'i)
Book: The Book of Marriage
Narrator(s): Abdullah bin Marrah عبد الله بن مرة الزرقي, Muhammad bin Bashar Bindar محمد بن بشار بندار, Muhammad bin Ja'far Ghandar محمد بن جعفر غندر صاحب الكرابيس, Shu'bah bin al-Hajjaj شعبة بن الحجاج

“Sahlah came to the Messenger of Allah and said: ‘O Messenger of Allah, Salim enters upon us and he understands what men understand, and knows what men know.’ He said: ‘Breast-feed him, and you will become unlawful to him thereby.’ (Ibn Abi Mulaikah, one of the narrators said:) For a year I did not narrate this, then I met Al-Qasim and he said: ‘Narrate it and do not worry about it.'”

Source: https://parallelquran.com/hadith/sunan-al-nasai-3328/