I was O hubby was A or B (cannot remember which). Now there is no intermixing of my O blood with the baby,(cannot cross the placental barrier) but the baby from conception is foreign to my O type blood and I build up anti-bodies to the few sluffed off AB blood cells that can cross the plantcental barrier & gets into my system....The anti bodies that my system set up to attack the AB blood cells can cross the placental barrier and attack the blood of the baby I am carrying. Baby #2 was in trouble at birth. The anti bodies from me were still attacking his blood. They didn't let the umbilical cord dry up, because they thought they might have to do a complete transfusion on him....Every time they brought him to me he had another toe bandage on as they keep track of how he was fighting off my antibodies and he had a rash all over his body....after 3 days the doctor said he was doing much better and had passed the dangerous time for transfusion...I was told not to have any more children or they would probably not survive...
I had 4 more, but the last one only live 10 hours and had multiple problems....Spina Bifida mylomengesoceil. /sp. paralyzed from the waist down plus other birth defects...that's when I stopped having children...But I figure the last 3 that had no problem were probably O type or God just wanted them here...
sorry for some of the bad spelling...
Growing up, I knew a couple of kids from parents with this situation; at least one of them had to have a blood change at birth.