Yup, I have two kids, one HG+ for sure and one that I suspect is, and they were also polar opposites in terms of putting things in their mouths when they were babies.
One sucked his thumb--usually when he was thinking--but put nothing else in his mouth ever. He stopped sucking his thumb at 3yo, the very second the dentist told him to stop and gave him reasons why. He never sucked his thumb again.
The other child hated pacifiers and was never a thumb-sucker, but he would have put a Buick in his mouth if he thought he could get away with it! Nothing was safe!
