Thanks for the replies and reassurances. I had an optometrist check his vision prior to school but nothing else checked as far as vision. He is 5 and 7 months now. His prior daycare was reviewing letters and their sounds and trying early Bob books. At the time I was unaware what K is like and thought they were pushing him too soon. I was remembering my youth and playing all day in K. But daycare teaching was cursory as he actually needed remediation with half his letters. Now he can sound out many words but can only say a few fluently. I'm stuck between wanting to push him to catch up with his class and "peers" (most older than him), and not pushing too hard. It's such a hard balance.

Life is the hardest teacher. It gives the test first and then teaches the lesson.