None can be their mothers except those who gave them birth
ok but even this is open to interpretation in the sense of today's technology yeah? When a woman's egg is fertilized by her husband's sperm, she gives that fetus the ability to be born. DNA test would confirm that the wife is the biological mother.
As far as breastfeeding - I think there is reference to wet-nurses in the Koran but I have to check on that....I seem to remember something about it, that a woman who gives her milk to another's child becomes a sort-of mother to that child - to the point that the child would not be able to marry the wet-nurses children.
That's right, marriage between milk brothers and sisters is not allowed, it's in ahadith but i don't think it's mentioned in Quran.
Can the DNA test confirm who bore the child?