My children aren't exactly concerned with "normal." They're either abnormally big or abnormally small, never right down the middle. They either do things quite advanced (okay, maybe not) or quite a bit on the tail end of normal. Nobody walked before they were a year. As a matter of fact it was several months afterwards. :)
Teeth are no exception to this precedent. I even thought Addy might make it to her first birthday without any teeth but around 11 months she finally popped one through. Nicholas seems to be on the same boat. He's 13 months old and just has two bottom teeth... but any day now I think we'll see 3 or 4 new ones on top!
Its a good thing I think gummy smiles are so cute. :)