Don't worry too much about it. My youngest daughter just turned 1, and up until last week she had absolutely No Teeth
. I took her for her checkup and the Dr. said that as long as she gets at least a tooth by the time she was 18 months she should be fine. In the span of 1 week she got a whopping 6 teeth all at once! 4 teeth on top and 2 on bottom. My 2nd daughter (now 2) got her first 2 teeth at six months. It was so weird because they were the top 2 canines so she looked like a Baby Vampire
when she smiled!
So in conclusion, kids get their teeth at different ages and in different places(top or bottom). And if you are seriously worried that something is wrong then take them to their regular Dr. Their Dr. can tell you if its something to really be concerned about.