Hadith No: 1
The accusation against Ibn Darām is: that he is a Rāfidī loyal to Muhammad and the family of Muhammad, peace be upon them.
Ibn Hajar al-Asqalani - Lisan al-Mizan - Letter Alif - Those Named Ahmad
Volume: (1) - Page Number: (268)
[The text is lengthy, so only the relevant excerpt is provided here]
824 - Ahmad ibn Muhammad ibn al-Sarri ibn Yahya ibn Abi Darām, the hadith scholar Abu Bakr al-Kufi, the Rāfidī, the liar.... Al-Hakim narrated from him and said: A Rāfidī, not trustworthy. Muhammad ibn Ahmad ibn Hammad al-Kufi, the hadith scholar, after dating his death, said: He was generally upright in his affairs for most of his life, but in his last days, he was often read to on the topics of criticism in his presence, and a man was reading to him: that Umar kicked Fatimah until she miscarried Muhsin.

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Reference: Lisaan al-Meezan Book 1

Hadith No: 2
The accusation against Ibn Darām is: that he is a Rafidī (a denier of the first caliphs) loyal to Muhammad and the family of Muhammad, peace be upon them.
al-Dhahabī - Siyar A'lām al-Nubalā' - Volume 20 - Ibn Abī Dārm
Volume: (15) - Page Number: (578)
[The text is lengthy, so only the relevant excerpt is provided here]
- .... Al-Hakim said: "He is a Rafidī,not trustworthy." And Muhammad ibn Hanād, the hafiz, said: "He was generally of sound conduct for most of his life, but in his later days, he often had passages on criticisms of companions read to him." A man was reading to him: "that Umar kicked Fatimah until she miscarried Muhsin."

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Reference: Seyar A'laam al-Nobalaa Book 15

Hadith No: 3
Ibn Darām's accusation is: that he is a Rafidi, an adherent of Muhammad and the family of Muhammad, peace be upon them.
Al-Dhahabi - Mīzān al-I'tidāl fī Naqd al-Rijāl - Letter 'Alif'
Volume: (1) - Page Number: (139)
[The text is lengthy, so only the relevant excerpt is provided here]
552 - Ahmad ibn Muhammad ibn al-Sarī ibn Yahya ibn Abi Dārim, the narrator Abu Bakr al-Kūfi, the Rafidi, the liar.... Al-Hakim narrated from him and said: Rafidi, not trustworthy. Muhammad ibn Ahmad ibn Hammad al-Kūfi, the hafiz, mentioned - after dating his death: He was generally of upright conduct for most of his life, but in his later days, he was often read to on the shortcomings of others in his presence, and a man was reading to him: "Indeed, Umar kicked Fatimah until she miscarried her son, Muhsin."

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Reference: Meezaan al Aietedal fi Naqd al Rijal Book 1

Hadith No: 4
Al-Shahrastani's Condemnation of the Nazamiyya's Belief in Umar's Attack on the House of Fatimah, peace be upon her
Al-Shahrastani - al-Milal wa al-Nihal
Volume 1: The Muslims - Chapter 1: The Mu'tazilah - The Nazamiyya
Part: (1) - Page Number: (53 > 57)
[The text is lengthy, so only the relevant excerpt is provided here]
3 - The Nazamiyya: The followers of Ibrahim ibn Yasar ibn Hani' al-Nizam, who had studied many philosophical texts and混合d their ideas with those of the Mu'tazilah, distinguishing himself from his companions in certain issues: .... He further increased the falsehood by saying: that Umar struck Fatimah's abdomen on the day of the pledge until she miscarried the fetus from her womb, and he would say in the morning: "Burn her house with those inside it," and there was no one in the house except Ali, Fatimah, Hasan, and Husayn."....

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Reference: Al Milal wa Nahl Book 1

Hadith No: 5
Al-Safadi - al-Wafi bil-Wafayat - al-Nizam al-Mu'tazili
Volume: (6) - Page Number: (12 > 15)
[The text is lengthy, so only the relevant excerpt is provided here]
- .... Ibrahim ibn Siyar ibn Hani' al-Basri, known as al-Nizam, with a dotted ظ, wasaknown as that by the Mu'tazilah because of his eloquent speech, both in verse and prose. Others said he was named this because he would arrange beads in the bazaar of Basra and sell them. This Ibrahim was the nephew of Abu al-Hudhail al-'Ullaaf, the elder of the Mu'tazilah, and he was very intelligent .... He said: "Umar struck Fatimah's abdomen on the day of the allegiance, causing her to miscarriage her child, al-Muhsin."

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Reference: Al-waafi Bil Wafayaat Book 6

Hadith No: 6
Ibn Abi al-Hadid - Sharh Nahj al-Balagha
Volume: (6) - Page Number: (49)
[The text is lengthy, so only the relevant excerpt is provided here]
- .... And Fatimah saw what Umar had done, so she shouted and wailed, and many women from the Hashimites and others gathered with her. She went out to the door of her chamber and called out, "O Abu Bakr, how quick you are to aggress against the family of the Messenger of Allah! By Allah, I will not speak to Umar until I meet Allah."
Unfortunately, we did not find any link to the narration.

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Reference: Sharh Nahj al-Balaaghah Book 6