Hi there, i'm a first time mom to a boy. My son is now 10 months old. The only concern i have is that one of his teeth on top front one is black and blue. The skin is. The tooth has not broken out yet. Its been likethat for almost a month. I've spoken to the doctor and he just tells me to watch it. How long is a tooth suppose to taek before coming out like this? He also has two teeth bottom row sides that have not come out. Everyone has told me they should have been out by 7 months...is there something wrong ? should i really worry about this?