A child born with blood type A and blood type AB will not be hemolyzed if both parents are RH-positive, but may be hemolyzed if the mother is RH-negative and the father is RH-positive. 1. Children born with blood type A and AB have three types of blood: A, B and AB. Whether the mother is A or AB, there is no anti-A or anti-B antibody in the mother’s body, and the mother’s blood entering the child’s body during delivery will not lead to the destruction of red blood cells in the child’s body, so hemolysis will not occur. 2. The mother is RH-negative, no matter the father is RH-negative or RH-positive, the child’s blood type is RH-positive and RH-negative, if the child is RH-positive, due to the presence of RH antibodies in the mother’s body, the mother’s blood enters into the child’s body at the time of secretion, which will lead to the destruction of red blood cells, and then lead to hemolysis, if the child is RH-negative, then hemolysis will not occur. In conclusion, there are 26 blood group systems in human beings, and although ABO hemolysis is the most common, it is not comprehensive to determine whether a child will suffer from hemolysis simply from the ABO blood group.