Sunan an-Nasa'i 3308
سنن النسائي#3308SahihIt was narrated from Umm Fadl that the Prophet of Allah was asked about breast-feeding and said:"Suckling (Al-Imlajah) once or twice does not make (marriage) prohibited." And (one of the narrators) Qatadah said (in his narration): "Suckling (Al-Massah) once or twice does not make (marriage) prohibited
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiSahih Muslim
In-book reference: 26:113