I have been referred an almost 5 yr old boy who only uses vowel sounds to communicate. He has passed a hearing screening. His tongue and mouth appear to have adequate movement. When asked his name, he replies "uh uh" which means Victor. He seems to follow directions in class.
It is always better to enroll kids in kindergarten to develop their abilities. Couple of months ago, I wanted to enroll my son in one of reputed kindergartens. I had searched a lot and finally came to know about a Phoenix kindergarten where I felt my kid will learn new skills. I have enrolled him there and he has shown great improvement.