Fetus gets blood from mother

TheStar

I have heard that in the same way the WTBTS admits that plasma proteins transfer from mother to fetus, blood also transfers from mother to fetus, although the WTBTS doesn't admit this.
Does anyone know if this is true and if so where I can go to get more information on this? I have already looked at the twins case but is it only in the case of twins or always?
If anyone knows something about this please help. Thanks
Elsewhere

WTS's standing on the blood issue: "Strain the gnat and swallow the cammel"
"As every one knows, there are mistakes in the Bible" - The Watchtower, April 15, 1928, p. 126
Believe in yourself, not mythology.
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