1. Families who have given birth to a child with phenylketonuria have a 25% chance of having another child with phenylketonuria, and there is a high probability that blind births will lead to tragedy. Kong Xiangdong, Center for Genetics and Prenatal Diagnosis, Zhengzhou University First Affiliated Hospital
2. Couples who have given birth to a child with phenylketonuria are often afraid to give birth again for fear of having another child with phenylketonuria.
3. Phenylketonuria is a birth defect disease, and according to the Regulations on Family Planning issued by the National Family Planning Commission, couples who have had a child with phenylketonuria are allowed to apply for a second birth quota if a prenatal diagnosis is available.