My 12-year-old started her periods in May, and is already on her 5th cycle.
Her first one was 20 days long, the rest have been 17-18 days. Thankfully her periods are light, couple pads a day, and she says the cramps are just annoying, but her periods 6-7 days long so she's only getting a ten-ish day break and she does seem a bit more tired lately.
I'm worried and considering trying to talk to a doctor during the summer, but I also know that it can be normal for cycles to be weird at the start - I'm just more used to the other end of very long cycles - and I'm not sure what the doctor can do or is likely to do other than hormonal medication which I'm not sure the benefit-to-risks for at her age (and with conditions that make it riskier in the family) or check for anemia.
Any experience or tips to help support her would be appreciated.