A girl weighing 3100 g was born from the third pregnancy at home. On the 3rd day the mother noticed small hemorrhages in the umbilical cord, as well as "red spots" on the sclera eyes. The mother was not registered for pregnancy in the prenatal period. Nourishes baby breast milk as needed. During the physical examination is observed subconjunctival hemorrhage. During the laboratory examination it was established hemoglobin concentration - 155 g/l. Blood group in mother B (III) Rh-positive, in child - A (II)Rh-negative. What tactics to prevent the progression of this condition in a child will be most appropriate?