The "first year" molars usually come in after the first birthday. That gives you a whole year to get them. They are the big flat teeth behind the "pointy" canine teeth. So, you have the two front center teeth, the two front teeth on either side of those, the two "pointy" teeth on either side of those, and then you have the molars. That will give you a total of 8 teeth on top and on bottom. Just so you know, the molars frequently come in before the "pointy" teeth arrive.
Sometime after the 2nd birthday, you get the 2nd year molars just behind the first ones. That will give you a total of 20 primary teeth - a full set.
After that, you are done until about age 6 when the primary (baby) teeth start to fall out and the permanent teeth come in. You also get the 6 year molars about then. Later, you get the 12 year molars and last the 18 year molars (the Wisdom teeth).
at 6:41 PM on Aug. 29, 2008