In "Steven's Birthday," in Season Two, we learn that Steven's growth has stagnated somewhat, presumably because of his Gem half. In fact, his appearance has changed little for several years (he's actually chronologically 14). Naturally, this causes him some worry (particularly regarding his relationship with Connie). 

However, at the end of the episode, he discovers a single facial hair, indicating that he *is* maturing somewhat. 

It's been about two years in-universe since that episode, I think. Has Steven grown at all taller since then? Has his appearance changed with age in any other way?