Hello Thank you for placing your query on Health Care Magic Firstly he has just hit that puberty age. We need to give him a little more time. Undescended testis always have the chance of being a little hypoplastic. The manouvere of bringeing them down also compromises on their vascularity and that may result in a bit of hypoplasia. In addition 3 years is a little late age for undergoing surgery for undescended testis. But this delay mostly hampers sperm production and not hormone production (these are the two main functions of testis). And in addition it was only on one side. Even one normally functioning testis is capable of taking care of hormone requirements and sperm production. So he should not have any problems in fertility. As for his current hormone levels they are on the lower edge of normal. But i think if you give him a little time then may reach normal. If he is obese for his age, then encourage him to lose weight, both exercise and healthy diet wise. Sometimes obesity can result in apparent short appearance of penis as it is buried in a pad of fat. It will be best to consult a pediatric surgeon and not worry too much at this time. Hope that solves your query God bless you