Regarding prevention, it goes without saying that you should interrupt the behavior immediately. If she is banging against something hard, remove her from the object. There is really
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Little tummys else you can do. Try to discern when this is occurring. Two forces generally drive this behavior: it can be a response to frustration, or it can be a type of self-soothing. It is usually quite evident when frustration gives rise to the behavior. If the behavior is not frequent, there is likely not anything to worry about. Be sure to check in with the pediatrician about the status of her development, to be sure she's progressing normally.