DS got his 4 1 yr molars at 15 mos and didn't get his canines for a few more months. His first teeth came in not according to plan however--2 on bottom, then 2 on top, then 2 more on bottom instead of the classic 4 on top and 2 on bottom that babies often have. I think it varies so much--my friend's baby didn't get any teeth in until he 1st bday!
dd's teeth came in really random and not in the 4 tooth rule. she usually got like 1,3, or 5 at a time. she had her molars months before her canines came in- which just started to appear along with her last side incisors tooth. (see, 5 at a time, lol).