Hadith No: 1

Yahya related to me from Malik from Nafi that Safiyya bint Abi Ubayd told him that Hafsa, umm al-muminin, sent Asim ibn Abdullah ibn Sad to her sister Fatima bint Umar ibn al-Khattab for her to suckle him ten times so that he could come in to see her. She did it, so he used to come in to see her.

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Reference: Mawatta Maalik Book 30 Tradition No. 1282

Hadith No: 2
Al-Bayhaqi - Ma'rifat al-Sunan wa'l-Athar - Book of Breastfeeding - Chapter on What is Forbidden Due to Breastfeeding
Volume: (11) - Page Number: (259)
15456 - Abu Bakr, Abu Zakariya, and Abu Sa'id narrated to us, saying: Abu al-Abbas narrated to us, al-Rabi' narrated to us, al-Shafi'i narrated to us, Malik narrated to us, from Nafi' from Safiyya bint Abi Ubayd, that she informed him that Hafsa, Mother of the Believers, sent with Asim ibn Abdullah ibn Sa'd to her sister Fatima bint Umar to breastfeed him ten times so that he could enter upon her while he was small and nursing. And she did so, and he would enter upon her.

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Reference: Ma'refah al-Sunan Wa Al-Aasaar Book 11

Hadith No: 3
Al-Bayhaqi - Sunan al-Kubra - Book of Fosterage
Chapter on those who said: Only five sucklings make marriage unlawful
Volume: (7) - Page Number: (754)
15640 - Abu Zakariya and Abu Bakr narrated to us, saying: Abu al-Abbas narrated to us, saying: al-Rabi narrated to us, saying: al-Shafi'i narrated to us, saying: Malik narrated to me from Nafi' from Safiyyah bint Abi Ubayd, who reported that Hafsah, the Mother of the Faithful (may Allah be pleased with her), sent with Asim ibn Abdullah ibn Sa'd to her sister Fatimah bint Umar to nurse him with ten sucklings so he could enter upon her while he was small and nursing. And she did so, and he would enter upon her.

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Reference: Al-Sunan al-Kubra Book 7

Hadith No: 4
Al-Shafi'i - Musnad al-Shafi'i - and from the Book of the Differences between Malik and al-Shafi'i (r)
Volume: (1) - Page Number: (221)
- Malik narrated to us from Nafi' from Safiyyah bint Abi Ubayd that she informed him that Hafsah, the Mother of the Believers (r), sent with Asim ibn Abdullah ibn Sa'd to her sister Fatimah bint Umar to breastfeed him ten times so that he could enter upon her while he was small and nursing, and she did so, and he would enter upon her.

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Reference: Musnad al-Shaafe'i Book 1