Don't worry!
My DD1 got her teeth (I think) at 6 m/o. However, my son didn't get his until over a yr old and now my DD2- Heidi (Aug baby) is still entirely without teeth. There is some white poking through but just barely.
Teeth are like anything else, they get them at different rates.
p.s. I guess I joined up while you were away. I'm new here. Name's Rebecca, just wanted to introduce