It is usually normal for a ten year old to be circumcised but not have a long penis because the ten year old has not yet reached puberty. Puberty in boys is usually around 13 to 18 years old. Normally, the penis grows rapidly only after a boy enters puberty and matures by the time he is about 18 years old. So it is usually normal for a ten year old boy’s penis to not finish developing because boys at this age have not yet entered puberty. Some boys enter puberty earlier, but also in about 11 years old, parents do not need to worry first, can pay attention to observe the child’s subsequent development. It is important to note that some children are obese, which can cause fat to accumulate near the penis, making it appear that the penis is not long, when in fact it is partially encased in fat, and will return to normal when the child loses weight. If a boy’s penis has not begun to develop after the age of 16, and the length of the penis is lower than that of boys of the same age, it is best to take the child to the hospital to do androgen, endocrine, adrenal function and other tests, to make clear the cause of the lack of development of the penis, and then give intervention treatment.