Not all syndactyly is hereditary. The chance of syndactyly being hereditary is about 10-15%, and when many children come to the clinic, we screen their genetic background. We find that not all children have a family history or genetic history. A small percentage of children whose fathers or grandfathers have syndactyly have syndactyly, and the children have syndactyly, which we believe is genetic. However, there are a large number of children who do not have genetic factors or a family history of syndactyly. We believe that these children do not have a genetic predisposition to syndactyly and that their syndactyly may be caused by external factors or maternal factors. Many parents who want to have a second child come to the clinic, but because the older child has syndactyly, they are very hesitant and torn, worried that the second child will also have syndactyly, but in fact, the second child does not necessarily have syndactyly, and if you want to have a second child, the mother should pay more attention during the preparation and the whole pregnancy, so you do not have to worry too much about this problem.