@Hannah you are right I looked it up ad well, something to do with extra saliva and acid. I was wondering if anyone else noticed the same.
Just started to notice this the last few days. My toddler was like this as a baby as well when she was teething x
We’re seeing the same with ours. She’s never been a sicky baby but is suddenly bringing up her milk randomly through the day, not just after a feed. My instinct is that it’s to do with her being so much more dribbly and swallowing lots of saliva? Maybe it’s filling her tummy more or messing with stomach acidity? Just a suggestion but no idea if I’m right!