At present, there is no normal standard value for the length of a baby’s penis in China. Some of them are called occult penis, and examination can reveal that it is not only a layer of skin, but also a penis inside, which requires surgical treatment. Some children have the problem of prepuce, which is generally tightly wrapped and can affect development, and this condition also needs to be treated. In addition, there are some children with short and thin penises, and they need to go to the endocrinology department for chromosome and sex hormone tests to determine if the child has a problem and to find the cause of the short penis development.