Blood typing, Gastroschisis, and Transfusion (a) Birth... Again ...?

I have previously typed out a question in hint to Gastroschisis altering a child's blood type at birth. The father is O, the mother is B, and the child is AB. I have done months of research and found that there is no way possible for my fiance to be the father. However, once confronted near the evidence obtained, the mother of the child only stated me to be an idiot because her child had a transfusion. I know I probably already know the answer to my examine, but I still have to ask. At birth, and before a transfusion can take place(unless it is an emergency and afterwards O can be used), does the child's blood not have to be typed? I know that AB can recieve blood from all donors, and can only dispense to other AB's. However, this moron is beginning to get the best of me. I do not like suprises, and want this adjectives to come to an end. Please help make the nouns with blood types, gastroschisis, and blood transfusions at birth.. PLEASE!
Answers:
Early in fetal life a fetus may be immunologically incomplete, but by birth the immune response to blood types is present (witness jaundice due to ABO incompatability). Even contained by an emergency Type A blood would not be given to a newborn who is O or B.

So the possibilities are: incorrect typing of mother, father or infant; the infant is a chimera (very, very rare); or someone else was the father.

Gastroschisis is not a factor in the blood typing.

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