can I apply DLA for my autism child

Hi every one it’s lovely to register here for fist time. My son is 8 and has autism which diagnosed 5 years ago. I’ve got DLA for him. Now my question is about my another baby he is nearly 3 and I can see exactly sane signs to him they way he spoke late the way he communicates and etc. 

I wonder if I can apply DLA for him too as I struggle with him in many cases. He has seen a psychologist but hadn’t been diagnosed yet. Is there any one can give me some advise what to do please. 

Thanks a lot. Xxx