My DS is 6.5 actual - 3.5 adjusted and I am pretty sure he is teething. I do not see any teeth yet but he is drooling terribly and putting everything/anything in his mouth... I can calm him down but my usually even tempered baby boy is pretty irritable. I've looked online and it seems most babies start teething around 4 months, so I guess it is probable. What are your experiences and how long does the teething last?