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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It is. They will put everything into their mouth for quite a Long while. They are learning, registering shapes, sizes, texture when they put things into their mouth.