I had a kiddo do this when I introduced a sippy cup.  It was involuntary,
like nipple confusion.  I'm so glad I never had to use bottles, because I
can't imagine it turning out well with him.

The cure for us was to get rid of all sippy cups, sports bottles, anything
but a regular cup, and then when I offered him the breast, I kept a finger
alongside the nipple, so if his teeth closed down first, I would stop it.
 If he was starting to latch properly, I would move my finger.  It helped
break the pattern.  In a couple days he had the movement down and the
muscle memory to remind him that teeth have no involvement in drinking from
either the breast or any other vessel.

Lynn Carter OFS LLLL IBCLC
Missouri, USA

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