Stressing about it will not help you; but like most people here will tell you, trust your Mommy-gut.
Just in case, I would ask around for references of good SLP's. When I started asking, even those using an SLP wouldn't recommend theirs! I was so fortunate to have found one finally, after a few "misses."
I would wait until 2 to have him tested again. He may pick up a lot more in the next few months; but in my opinion he should be speaking more than a few clearly, especially if he is advanced otherwise. I am not an expert; so please take my advice with a grain of salt. Good luck!
