'A'isha (Allah be pleased with her), Suwaid and Zubair reported Allah's Apostle (ﷺ) as saying
One suckling or two do not make (marriage) unlawful.
Umm al-Fadl reported
A bedouin came to Allah's Apostle (ﷺ) when he was in my house and said: Allah's Apostle, I have had a wife and I married another besides her, and my first wife claimed that she had suckled once or twice my newly married wife, thereupon Allah's Apostle (ﷺ) said: One suckling or two do not make the (marriage) unlawful.
Umm Fadl (Allah be pleased with her) reported that a person from Banu 'Amir b. Sa'sa said
Allah's Apostle, does one suckling make the (marriage) unlawful? He said: No.
Umm Fadl (Allah be pleased with her) reported that Allah's Apostle (ﷺ) said
Being suckled once or twice, or one suckling or two, do not make marriage unlawful.
In the narration transmitted on the authority of Ibn Bishr there is a mention of two sucklings and Ibn Abu Shaiba has narrated it with a small variation of wording.
Umm Fadl (Allah be pleased with her) reported Allah's Apostle (may peace be'apon him) having said this
One or two sucklings do not make (the marriage) unlawful.
Umm Fadl (Allah be pleased with her) reported that a person asked Allah's Apostle (ﷺ)
Does one suckling make (the marriage) unlawful? He said: No.