Yes normal! I was worried too, incased like us, unable to breathe properly or blocked nose then need to use mouth to breathe, but thats not the case for baby. my baby now almost 3 months also always sleep with mouth open everyday. Even when i try to close it itll open back but its normal.
Normal, better if I’m not wrong. Prevent Sudden Death Syndrome?
It’s normal, it will go away as baby grows. 😊