My DS is coming up to four months old. He contact naps during the day, and he always has his mouth wide open. I’ve never thought much of it, but just decided to do a quick google, and what’s coming up seems to suggest it’s not normal snd that it indicates that he’s not able to breathe well through his nose. Just wanted to ask other mums if their LOs sleep with their mouths open, or if this is actually unusual and something I need to inform my GP of?!