My 16 month old has 8 teeth currently, 4 top, 4 bottom. His gums in his mouth have been extremly swollen for the past 5 months now, and no new teeth have come in yet. I know it can take a while for babies to get teeth, but this has been going on for so long (irritability, sleepless nights, biting, ect.) I don't know what to do, its becomming harder and harder, especially at meal time when his food options are limited because he has no back teeth at all.