Vera Alexander claimed to have witnessed this. During The Trial of Adolf Eichmann, she said:
Attorney General: Do you remember the notorious Dr. Mengele?
Witness Alexander: To my sorrow - very well indeed.
Q. We have already heard about him, but there is one matter which we have not yet heard about. Do you remember the experiments he used to conduct on twins?
A. I only witnessed one experiment.
Q. What did you witness?
A. There was a set of twins, Gypsies, whom he took away one day from the block where I was - that was the Zigeunerlager - the Gypsy camp. Some days later, he returned them, with veins in their arms and their backs sewn together.
Presiding Judge: I did not understand that.
Attorney General: He sewed them.
Presiding Judge: Sewed the veins together?
Witness Alexander: Yes.
Q. Did he turn them into Siamese twins?
A. He sewed their arms together - they were already full of pus, and full of wounds.
Attorney General: And they did not live much longer?
Witness Alexander : I succeeded in getting out of there, before...I asked the Lagerfuehrer who had transferred me there to send me back to the women's camp.
I found Alexander being quoted in a February 07, 1985 Chicago Tribune article where she apparently contradicts something she said at The Trial of Adolf Eichmann:
Vera Alexander, 62, who lives in Israel, described how she worked as a warden in a block housing about 100 Gypsy twins.
She told how Mengele impregnated one girl with the sperm of another twin, pampered her during her pregnancy and attended the birth himself.
``But when he saw that there was only one baby and not twins, he tore the baby right out of the mother`s uterus, threw it into an oven and walked away,`` she said. ``We saw this.``
She claimed she only witnessed ONE experiment during the trial, but she claimed in 1985 that she also witnessed Mengele impregnating a girl with the sperm of another twin, ripping out a baby from a mother's uterus, and throwing the baby into an oven. Did she simply forget about this experiment during the trial? Seems like it would've been an incredibly difficult thing to forget!
Do any mainstream Holocaust Historians claim the "sewing experiment" is true? Has any mainstream Holocaust Historian ever said it's unlikely that Mengele "created Siamese twins"?