A study published last year on rhesus monkeys showed that testicular development in the monkeys was delayed, but that normal development was reached. To my knowledge, no further studies have been published on the matter. I urge you to pose this very question to your son's prescribing doctor and obtain his feedback - as he has detailed information regarding your son's medical history he may have other information to add.
I am sure you have done so, but nevertheless a reminder to handle this delicately with your son as he may begin to feel self conscious should he identify any differences between himself and his peers.
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