Children’s penis does not develop, the following treatment can be carried out: First, it needs to be clear that children are in the process of growth and development, can not be one-sided according to the size of an organ at a certain moment to measure whether it is normal. For example, the boy’s penis generally begins its first rapid development period only at the age of 7-12, after which it does not reach full development of the normal reproductive system until the age of 18-19. So you should go for an ultrasound to determine if it meets the growth and development standards of the age the child is at the time. Second, there may be too much subcutaneous fat, and even the parents see the exposed part and ignore the part hidden by the fat, so they should do an ultrasound examination. Thirdly, if there is indeed a developmental problem, the male androgen, growth hormone and other endocrine problems need to be checked, taking into account the real abnormalities of sexual characteristics due to abnormal hormone secretion or genetic conditions, such as comprehensive sexual developmental dysplasia or chromosomal problems, manifesting as abnormal penile development. To sum up, first of all, don’t be anxious because there are indicators of cyclic development of children, namely the order of nervous system – height – reproductive system. Secondly, to check whether the penis is really short, generally through ultrasound. If you encounter pathological conditions, it is recommended to go to the endocrinology department to systematically screen the cause.