Hi - my daughter has been doing this similar thing since she was a baby. She mostly does it when she is excited, but also does it when she is anticipating something. If she is standing, her body stiffens, arms by her sides and hands opening and closes rapidly. Her head tilts sideways also. When she was younger her mouth would form the shape of an 'O'. Now at seven, she hums. She seems to hold her breath throughout an episode. When I hold her hand, she stops and will finally breathe. I've always been told that it would go away, but it hasn't. I've discussed this with pediatrician, who did not seem concerned. I'm wondering who can I talk to to help her stop. She said she wants to because she doesn't want anyone making fun of her. I should also mention that doesn't realize she's doing it till she notices she's not breathing or I hold her hand. Thanks for any help!