Being suckled once or twice, or one suckling or two, do not make marriage unlawful.
Sahih Muslim Book 17, Hadith 26
← Previous Hadith Allah's Apostle, does one suckling make the (marriage) unlawful? He said: No.

Sahih Muslim Book 17, Hadith 25 Next Hadith → 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.

Sahih Muslim Book 17, Hadith 27