DD had a speech eval about a month ago because she was saying quite a few single words, but not putting them together. She was still grunting and pointing for things she wanted even though she knows the words. DD ended up qualifying not only for Speech but also for Develeopmental Therapy. I was so skeptical about the Developmental Therapy, but am so glad we are moving forward with both therapies. She's only had a few sessions, but I've seen a dramatic improvement.
I agree with PP's about calling your school district for an eval. Let the experts determine if it's normal development or if there's a delay. It's better to get the help early then waiting until it impacts your DS's school performance.