@MoonlitexAngel I'm experimenting a bit. I saved before aging up my child, so I've been going back, freezing aging and saving each day and trying again to see if maybe after a certain amount of days it will work. It looks almost like the child's face on a teen's body.
Edit: After some testing, it doesn't seem to matter how long I wait after pulling the tooth. In CAS, I aged my child to a teen and the incorrect scaling of his facial features appear. I placed the same family that I started off with and aged his infant self to a teen and it was how he was supposed to look. So somewhere along the line, the appearance of my sim changed and it is frustrating as that means I am going to have to personally change his features to as close to the original look since it got screwed up in my save.
Edit 2: I went through all my saves (ones I made before the update/pack and ones made after the update/pack). I went into CAS and aged up the infants and toddlers to teens and their appearances were normal. So I'm thinking that this is related to the tooth bug, unless there is something else that I'm missing.