I just recently read that if a woman's blood type is Negative O and her partner's blood type is Positive (of any blood type), this can be a bad sign! If the baby in the pregnant mother has a Positive blood type, the mother's blood(being a Negative O) will attack the baby as though the baby is an 'infection.' I guess its because the mother's body does not recognize that it has conceived a child and thinks its fighting a cold or something. Thoughts??