it is mentioned in your Heritage books like ( alseera alhalabya) -Halabi biography- Volume 1, page 67. that Abd el Moteleb and eben abdellah (supposdely mohmmed father) were married same day, same place (majles).
In (Al tabaqat al kobra) -Major classes- by Ben sa'ad, Volume 1, page 99. that ebn abd ellah died when he was 25, same year he was married.
In (Asad Al ghaba)- jungle Lion , by Ebns Atheer, Volume 2, page 69, that Hamza (son of abd elmotleb) was 4 years older than mohammed.
So, Were Mohammed mother ( Amnah) preganant for consecutive 4 years? Is that possible?
In ( Aldorr Almanthor) -Scatterd durr- by Jalaladeen alssyoti, volume 4, page 330. "when people doubted mohammed descent, he said " God got me out of parents who did not meet in adultery (sifah)."
Pre-Islamic traditons and customs of sexual intercouse: Halabi biography- Volume 1, pages 69/70. Said by aisha, sexual intercourse are 4, 1. first, people like today, 2. Second: adultery: (Nokah elbghaya), which is a groupe of men have sex with a prostitute, and whoever make her with a child, considered his by his/her (the baby) looks. Halabi continues, and Amr ebn ela'ass was a child of this type., as his mother ( amr ebn ela'as mother) has been with 4 men,( Al a'as, abu lahb, omay ebn khalaf, and abu sofyan ebn harb). and she said it was ala'as's son "because he was spending money on my daughters" she said. All of those men wanted to be the father of the child (Amr), people then did not consider this as an adultery, nor ashamed of it.
3. Third: Shopping intercourse ( Nokah al estebdda'a): After woman Menstruation, her husband tells her " go shop from----" means become preganant from that man. Also, did not consider this adultery or shame.
4. Fourth: groupe intercourse, ( Nokah al jama', Al sifah): when a woman be with less than 10 men, and become preganant, then she gather those men, she has been with and tell one of them, that her baby is his ( she decide who's the father).
-Then Islam (mohammed) came and put shame on these last 3 types of marriages. In (alseera al halabya) that ali ebn abi taleb, othman ebn afan, al hassan, and amr ebn yasser used to cal names, andput shame on Amr ebn el a'as for the way he was concieved.
In Al Qurtobi, Volume 15, page 172. "Woman is like sheep, cow and camel, because all are ridden" Soooo humilating to all women, no sense of any respect even to humanity.
In (Sunan Al nesa'ai al kobra)*, Volume 5/page 51. Al Abas ebn abd el moteleb came to mohammed and was mad, as Mohammed asked him, what angers you? he told him, what Qoryesh people has to do with us? they meet each other happy and smiley and meet us with cold, frown faces, (after he told him that Qorysh people are saying about you 'mohmmed' that "he is like a palm leaf in a sweep trash". ) Mohammed got mad, that his face turn so red.
In (Alostadrak ala al saheehayen)* about same issue. Volume 3, page 375. that mohammed was so embarressed that his sweat fall between his eyes.
In (Al Tabqat al kobra) by ben sa'ad, Volume 1, page 98. Said by Es'haq ben abd ellah that Mother of Mohammed (amnah) said that I've bear kids, and never bear a lighter baby like him.
In (Al Durr al Manthor) volume 4, page 302/303. Mohammed said " I went to my mother's grave praying to God to give me permission to get my mother's intercession after I die, but he denied me. I asked him to forgive her, but he wouldn't allow me. Then Gabriel (the angel) came to me and told me, "to exonerate your mother"
He gave himself the permission to exonerate his own mother, meanwhile he tell people to respect and honor your parents
* I apologize for not translating the names, as some of those reference books hard or can't be translated.
** not even one sentence was mentioned about Mohammed mother by her OWN son, in any of his ayat (versus)