<s>[INST] hi i have a son age 8 and 1/2 years. while his penis is flaccid it looks very small and most of the time it goes inside his body. in errect state its 2 cm long. he is worried why his penis goes inside and looks very small as compared to his cousins. Plz answer. [/INST] Hi,Thanks and welcome to healthcare magic.The size of the penis may be small and buried inside specially in obese boys.The size of the penis will increase when he attains puberty by 16-18 years of age.Erections will occur at that time with discharge some times.Hope this reply is OK for you.Please feel free to ask further queries if any.Dr.M.V.Subrahmanyam. </s>