My 3yo niece has developed a weird new habit. She liked to chew on her hair. Is this normal?

i have a friend whose daughter is suffering from a medical condition known as trichotillomania, in which a child starts pulling at and chewing hair. your niece is 3 and it is possible that she accidentally started doing this, and enjoyed it. i would say don't panic yet and instead try to divert her attention. don't tell her to not do it all the time, as it could make her want to do it more. if she does not stop, consult a doctor. you can read more here https://www.trichstop.com/info/children/trichotillomania-in-children