Thanks for your query at DoctorSpring.com
I have gone through your question in detail and I can understand what you are going through.
Not to panic at this stage. The growth in genitals is mostly in spurts and a small penis may still grow with time and the age of 5 years is still small. But still it's better to be cautious.
The growth of sexual characteristics occur due to hormones and two hormones that are important are growth hormone and testosterone. You may get these levels tested in the blood. If there is any problem in their levels, they need to be corrected. Otherwise, if these test results are normal, then you can simply wait for a few more years to let the natural growth happen.
Hope this helps,
In case, if you have any further query, do let me know.
Dr. Srikanth Reddy
Patient replied :
Thanks for the advice.I think it would be better to perform a blood test for our satisfaction.
I shall inform you again after couple of days or when results will be came.
Sure update me after the results are with you.