hi my niece is having periods two times in a month that too for 11 days each is it normal or we need to go to the doctor she is just 14 years old

A. Six months one year can be very disturbing for kids but this is anyway is not expected or justified so I think your child whom you’re talking about is having a massive disturbance in hormones kindly consult your gynaecologist these things are normal to be seen or do not get paranoid