Hi Anna,

Its definitely possible that he is teething.

Milo got his first tooth at 3.5 months old (as did my brother and I)
He's now 13 months and has 10 so far.

I didn't notice his first tooth until he bit down on my finger and I though 'hmm that was a bit sharp'..hehe. My mum had been telling me for at least 4 weeks that he was teething, but I dismissed her and said its way too early for any of that.

They don't normally recommend bonjella and that sort of gel-type stuff for under 4 months, so I gave him a clean, cold face washer to mouth (he loves this anyway) amd some teething toys and books wiot the rubber corners etc for biting on.