It is possible for hemolysis to occur in a child born to a person with blood type O and blood type A. Generally, if the father has type O blood and the pregnant woman has type A blood, the child delivered will not have hemolysis. However, if the father has type A blood and the mother has type O blood, the probability of hemolysis increases during pregnancy and after delivery. However, in general, the degree of hemolysis caused by ABO blood type incompatibility will be mild, and after breastfeeding, the baby will eat more and poop more, and the jaundice will gradually decrease, and severe hemolysis may require blue light or further treatment for the child. So if you are pregnant with these two blood types, you don’t have to be particularly worried and don’t be afraid to have a baby because of it.