Does the child’s blood type always follow the father? Of course not, if the father is type O and the mother is also type O, then the child’s blood type follows the father’s, and the child’s blood type is mainly determined by the mother’s and father’s blood types. If the parents are type A and type B, the child can be type A, B, AB; if the parents are type A and type O, the child’s blood type is A and O; if the parents are type A and AB, the child is A, AB and B; if the parents are type B and O, the child is B and O; if the parents are B and AB, the child can be A, AB and B; if the parents are O and AB, the child can be A, AB and B; if the parents are O and AB, the child can be A, AB and B; if the parents are O and O, the child can be A, AB and B; if the parents are O and O, the child can be A, AB and B; and if the parents are O and O, the child can be A, AB and B. AB, the child can be type A and B; and if the parents are AB and AB, the child can be type A, AB and B. From the above, it is clear that the child’s blood type is determined by the parents’ blood type, so the child’s blood type does not necessarily follow the father.