I have an 18mth old similar to this. Her tongue is always out. And whatever she holds, she almost mindlessly brings it to her mouth. I mostly have her trained not to do it but when she’s distracted or tired it seems to still happen. One thing that has helped her curb this habit is having her wear a drool bib, one of those bandana style bibs. When I put it on her, I tell her “its ok to put this bib in your mouth whenever you want but don’t put any toys in your mouth.” It actually seems to help a lot and she’ll often play with toys while mouthing the end of the bib.

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