A few days before a tooth came through we noticed he had slightly runny poo and a sore red bum so that might be something to look out for.
Definitely more aggy and sleep changes. Drooling and gnawing is also a sign. Might be a while till one comes through but I knew right away when my wee one started teething and kept questioning myself but I was right 🤣
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Sounds like it. Under 38 isn't a fever fyi just warm x