In general, there is no such thing as an advantage of blood type O. However, because of the absence of antigens in blood type O, it is possible to transfuse small amounts of blood to people with other blood types under special circumstances. Blood type O is a type of blood that can be categorized as A, B, AB and O. Blood type O contains neither A nor B antigens on the surface of the red blood cells. Under special circumstances, small amounts of blood can be transfused to people with other blood types, but it should be noted that the plasma of type O blood contains both A and B antibodies, and excessive transfusion may cause different degrees of hemolytic reactions in the recipient. If the pregnant woman has blood type O, she should check her husband’s blood type in time. If her husband also has blood type O, the newborn usually will not have hemolytic reaction, but if her husband has other blood type, the newborn may have hemolytic reaction, and needs to be checked in time. If you want to know the characteristics of O-type blood, you can go to the regular hospital to consult the doctor, for O-type blood pregnant women, regular checkups.