Lack of muscle development in teenage athlete

Patient : My 16 year old son is an athlete. Since going into high school he has been almost constantly involved in sports, three sports camps over the summer, football season and now wrestling. We have noticed that despite his increased exercise and healthier diet he is still not losing weight and doesn't seem to be developing muscles or increased strength. He is also developing what looks like female breasts. Also, for being 16 he is a bit behind other boys in puberty. We have spoken with his coaches and they assure us that he is working very hard, so the lack of muscle development isn't coming from being lazy. Is this something we should be concerned about?
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