A child born with type O blood and type O blood may have hemolysis, but it will not be ABO hemolysis, it may be RH blood group incompatibility hemolysis, etc. ABO hemolysis is a blood group incompatibility hemolysis between mother and child. It often occurs when the fetus is type A, B, AB, and the mother is type O. It is easy to induce ABO hemolysis, and it can occur in every birth. The child born with type O blood and type O blood is only likely to have type O blood, and ABO hemolysis is unlikely to occur. However, there are many causes of hemolysis in newborns, such as RH hemolysis. This type of hemolysis occurs when the mother is RH-negative (panda blood) and the child is RH-positive, and does not usually occur in the first trimester.RH hemolysis is more rapid and serious than ABO hemolysis. If the child has high risk factors for hemolysis, prompt management with the help of a doctor is recommended.