My baby likes to play with hair. Both mine and hers. She pulls it, twirls it and enjoys running her fingers thru hair. Is this normal?

I think they feel it's fun, so must stop them!! Their pulling is very pain, if don't stop they will keep pulling and bcum a bad habit instead. As they are exploring their sensory. Now my boy seldom pull my hair, i have to tie it up to stop his bad habit and let him explore his sensory elsewhere instead.