Matilda does it heaps. She started a few months ago and would just stick her finger down her throat (as if she needs help with the vomitting situation) I don't react at all. I move her or if she's in her cot & does it I put her on the floor in the room with all the lights out, change the sheets & resettle her. She only does it once a week now... and most of the time now its in a room full of people and no one is giving her attention, and usually she's in the playpen at the time so she's doing it to get out iykwim? But it has really calmed down, for a while there she was doing it a few times a day...