Bad Habit

At that age, it’s just part of their development. I wouldn’t consider it a “bad habit”

You can try offering toys such as teeters or if you’ve introduced food already, you can offer frozen or non frozen things in a feeder like frozen fruit.

I was going to say that it's kind of typical for the age, but not if he's causing himself to be sick. They have bitter nail polish. It's clear and it goes on his nail and it tastes horrific. It was designed to help nail biters and thumb suckers stop those habits, so it could work here? I'm just not sure because he's so young and I don't know if it's meant for kids that young.

I didn't. He just stopped by himself. I personally don't see that as a bad habit at that age

I heard you should not prevent them from putting hands in mouth unless they need cleaned first from play outdoors or touching something they shouldnt (like their dirty diaper) because mouthing is important for proper tongue thrust for eating and speech development.

honestly, i wouldnt say you should worry about it being “a habit” until 2-3 when they stop taking a paci (if they even use one). they are still getting teeth, they are gonna put their fingers in there lol