I don't know for sure, but it might be teething. Even if you don't see a tooth coming through or any white spots doesn't necessarily mean they aren't teething. My LO was an early dribbler and I constantly blamed it on teething but he didn't get his first tooth until he was 5.5 months! Just keep using bibs, I remember he would drench bibs all the time, he'd go through like 3-4 a day!
Same here - my lo is 12 weeks today and is constantly chewing/suckinghis hands! I know he's not hungry so have been thinking it's teething! Luckily he doesn't seem to be in any discomfort - just loads of dribble lol!
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