My 18 month old has a severe underbite. It's her jaw that's misaligned, not her teeth. I plan to ask about it at her next pedi and dentist visit, but I wondered if anyone else had experience with it? From what I'm reading online, it sounds like often, it isn't addressed until the kid is six or seven. Did your toddler grow out of it? If not, when and how did you try to fix it?