Hm. He looks taller to me! But we'll have to see more episodes to know for sure. I just remember noticing he was kind of short in season 1 (the armor stunted his growth?), but then Iroh's not tall so I figured maybe they just had a short family.

His mother looked pretty tall, though, and so did Ozai... so I'm guessing he's growing!

At least until the show demonstrates otherwise.