teeth

this is sort of a funny thing to notice and I'm not sure if it would fall into the realm of "normal" or not.

But, I just noticed this today in looking at some pictures.

this is a self portrait the Lucas took around March 28th just after we got him in China

This picture was taken May 31.

Look at Lucas's teeth.  Do "big kid teeth" really fill in that fast?  in 2 months?  How could he already be changing that rapidly?  I've watched kids grow before but these changes seem fast to me.