Serenity,

You are doing good things for him, and a half-day developmental preschool is ideal at his age! I am glad to hear about speech therapy, too. There are children's audio books, methinks, which you can put on when you don't feel like talking to your boy. You will feel better knowing that he is exposed to oral language which is being professionally rendered by the narrator. Counting with him is great. Have you tried patterns with him (say, you take a red block and then a yellow block and then again a red block etc. And at some point stop and ask him to continue).patterns build a foundation for future study of math (and he is already doing numbers).