Wow! Thanks for the update
how amazing that he was learning all that time and all of a sudden he showed you how much he knew (which was a great deal). It's great to read this in particular, for me, because my 15 month old daughter knows all of her letter sounds, and I feel she is on the cusp of a break through wih reading. She knows at least 15 sight words that she's shown me on her own and she reads letters everywhere making the letter sounds. I try not to test her either so sometimes it's hard to gauge where she is with her reading.
This update was perfectly timed for us. I keep meaning to expose her to Reading Bear but haven't done so yet. After reading this, I'm motivated to give it a go!