Why does my 2 year old pull her hair?
Hair-pulling in the under 2s is usually a self-comfort action, often starting as twirling their hair around their fingers and only later progressing to pulling. It is often associated with thumb-sucking but can also be related to boredom: young children who pull their own hair are often very bright. How do I get my 2 year old to stop pulling hair? What to do about hair pulling
Show him that it doesn't work.