An important part of explaining puberty to your son is to talk about pre-menstrual symptoms that a girl may experience, such as cramps, headaches, and bloating.
Tell him that a girl may also feel more sensitive in the days leading up to her period and that he shouldn’t take this personally – it might just have to do with her changing hormones.
Explain that it’s important for boys and girls to support each other through puberty, and be mindful of each other’s feelings.