It's wonderful that you're getting OT and ST while your son is still so young. The earlier the intervention, the better the results=a more normally functioning life for your child. When my daughter was 2.5, she only spoke in two word phrases, and understanding her was very, very difficult. She's been getting speech therapy since she was three, and I can say now her speech is nearly at age level (5.5), and pretty much everyone can understand her. Occasionally, we have to remind her to slow down and say her words clearly, but that's about it. The only two sounds she still struggles with are "th" and "r", but our ST tells us that's pretty normal for many 5 year olds. I think you will be pleasantly surprised by your son's improvement at the 6 month re-evaluation. Make sure you ask for a copy of the current evaluation and then the re-evaluation so you can see it on paper. My daughter started OT last July, and was re-evaluated after three months. When I saw a copy of the re-evaluation, I wouldn't believe the improvement in little things I hadn't really noticed. I recently read a book that estimated that kids with SPD are generally about one-third of their age behind developmentally. That's pretty accurate for my daughter socially and emotionally. She's at age level intellectually and physically. So, should you be concerned? Probably not, but stay on top of his therapy and continue to educate yourself regarding ways you can help him at home to adapt and compensate for his limitations. He will get better, but it's a slow road. Worrying won't change it. We can just accept it and do the best we can to love them and meet their needs.