My 3mo enjoys putting her fist in her mouth and chewing on her thumb. Is this part of her motor skills development, and should I pull her hand out from the mouth whenever I see her doing that? Sometimes, she will suck her fingers till she vomit as well. ?

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my girl does tht too! but I just let her be. I believe tht they will grow tired of their fingers if we don't stop them. its like, the more you want to stop them, the more they want to do it. (: