Hi, think this could be similar to what my daughter has been doing since she was 6 months. She used to do it as a baby when we put her in the car seat or high chair and carried on for ages. She used to pull at her clothes and hold her breath at the same time and was a nightmare to take out. She has gown out of it now at 4 and a half. Not sure if this is similar to what your daughter is doing?

Do you think these could be described as tics? I have a friend whose child has very mild tourettes syndrome. She sometimes has involuntary tics. She can't help it. Once the family, child and teacher understood what was going on, the tics became ok and life was ok.