My infant sometimes bubbles from the mouth. When he does this he doesn't seem to be distressed but I end up constantly having to wipe his mouth. Could this be because I am not burping him enough? Does this happen to other people?
Saliva and breathing sometimes can be a recipe for bubbles. It is quite normal.
Take a picture of it when a large one pops up and have laugh about it with your kid when he grows up.
It happened with my kids. They were always drooling, bubbling, and dripping with snot. Slugs are cleaner.