I've read many of the posts and I can definitely see both sides but I have to disagree with Cella's comments. What's with the quotes around the word "mom"?? As if having your child evaulated by Early Intervention or any other facility means you aren't a good mother? I'm offended!
I recently had one of my 2-yr-old twins evaulated by Early Intervention b/c I wasn't comfortable with her progress in many areas of development. The therapists agreed and she will be starting speech & occupational therapy shortly.
On the other hand, my 9 month old didn't start crawling until last week. She wasn't sitting up until last month. She didn't even start baby food until 5 months of age. And even though I believe in the merits of Early Intervention, I also realize that all children develop at their own rate. Something inside of me told me that I didn't need to be concerned about her (unlike the concern I felt about her twin sister).
Trust your mothering instinct. If this is something you're truly concerned about, a free evaluation can't do any harm. It's just the opposite. Whatever the results of the eval, you'll either feel better knowing your child is fine or you'll be pointed in the right direction to get your child the help they need.
Don't let ANYONE tell you what to do or make you think you are a bad "mom". This is a personal decision and I commend you for asking for advice. Chances are good that there's no need to be concerned, but why stress yourself out when there are resources available for things like this? Good luck MOM!