I know its hard not to worry when its about your own child, but my oldest son who is going to be five soon didn't talk until he was 2 1/2 and that was momma, dadda, car, truck, simple stuff like that. All children are different. My friends little girl, just turned 2 and she isn't talking at all, i have another friend who has a 22 mo old boy who doesn't talk. I would really try not to worry about it. He is still ONLY 16 mo. There is nothing that you can do. I have learned that if a child has had a lot of ear infections that that can affect there speech, only because everything they hear when they have an ear infection sound distorted like you are under water. Have you tried sign language? We teach our kids when they are toddlers sign language so that they can still communicate with us. we have had three kids and they all learned sign language at about 15 mo. When my daughter was little she signed all the time. It was great cause she couldn't talk but she could tell me what she wants. There is a great book called Idiots Guide to Baby Sign language. It talks about why you should teach your children to sign, how it can help them relieve stress cause they can communicate with you, all sorts of great stuff. The signs that are in the book are totally easy and only stuff that a toddler would use. Other then that all i can say is that all kids develop differently but they will all catch up to each other. I hope this helps you. Have a great day and God Bless!!