Syndactyly is a hand deformity that is second only to polydactyly and is sometimes confused with polydactyly. The most common type of polydactyly seen is thumb type II polydactyly, in which the two thumbs are joined together, and many parents mistake it for syndactyly, when in fact it’s thumb polydactyly. What is syndactyly? It is the complete or incomplete connection of the tissues of two or more fingers, which can be purely skin-on-skin, or accompanied by fusion of metacarpals and phalanges, as well as various forms of finger dysplasia. The presence of syndactyly affects the hand both cosmetically and functionally, and many parents are concerned about the possibility of inheritance of this hand deformity. From a large number of reports in the literature, including those that we often see, we now believe that syndactyly is somewhat hereditary. I am impressed with four pairs of babies, all twins, the father is syndactyly, the babies are also syndactyly, both male and female babies are syndactyly, the syndactyly area is the same, which is obviously hereditary syndactyly. Now let’s look at it from another angle. Is all syndactyly caused by genetics? Of course not, some syndactyly is not genetically related, these babies have no precedent of syndactyly in either parent’s family, only the child has syndactyly, which has nothing to do with genetics. It is possible that the mother has been exposed to some disturbances during pregnancy, such as infectious viruses, medications, physical stimuli, or chemical stimuli, including the more common second-hand smoke and formaldehyde, all of which may lead to the baby’s syndactyly. What can be done to prevent non-genetic syndactyly? Eugenics, in the early stages of pregnancy, pregnant women must pay attention to stay away from some abnormal chemicals, such as the house has just been renovated, have not been put in too long to live in, or that the pregnant woman is not very good health, frequent colds, may lead to the baby and finger, if the family has a plan to welcome the little one, this aspect should be particularly careful.