Hi, Thanks for posting in HCM. I understand your concern. Some of the boys could attain puberty little late. Hot flashes only cannot be taken as sign of puberty. You need to look for development of other secondary sexual characters like growth of axillary hair, pubic hairs, moustache and beard, breaking of voice and growth spurt. If such signs starts appearing, then you could tell that he has attained puberty. Such changes could sometime take about six months to one year to appear. You can check his serum testosterone levels once in 3 months and consult Endocrinologist with the reports for clinical evaluation and management. Hope the information provided would be helpful. All the best.