<s>[INST] Hi I have a 5 yrs old boy who was circumcised at birth. At infant stage we noticed that he would almost suck in hisentire penis which looked funny and wiered then but now as a preschooler i am a little concerned about his size. He too has started noticing that its different from others his age. Is there something i need to knw about? shouldi be visiting a doctor? [/INST] Hi I am Chat Doctor. . During infancy if the child has a stretched penis length of less than 2.5 cm then he needs evaluation. Usually in kids having small penis, the length of penis increases during puberty, but this can be reassured only after ruling out other endocrine causes (disorders of sexual development - DSD) of small penis. But still I can say that it could be a normal variant as it is the most common cause. Thank you for using Chat Doctor  </s>