My daughter started her periods on April and it lasts for 6 days now in July her periods last for more than 10 days....Is it normal???

A. Hai good morning !! Periods initially have more discharge in few of them due to harmones fluctuation ,normal flow with 6-8 days in some girls spotting until 8-10 days is ok. But more than 6-8 days with heavy flow need to be concerned issue which might result in anaemia, check with Gynaecologist.