Hi Melissa,
Your son could be normal, just a little slow, at speaking. However, it COULD BE a sign of a hearing difficulty. If he has not started making some effort to speak shortly, you may want to have his hearing checked. It could also be a symptom of autism, allergies, or other ability issues.
My third child was also very quiet. After two chatty kids, I just thought I was 'blessed' with a quiet one. At 18 months, he was speaking 'Mama do', and 'dink wa'. By almost three, it had not improved.
A friend adviced me to have him checked. Easter Seals may check him for free. Try this link for more information. You may want to call them.
http://chicago.easterseals.com
They checked my son and determined hearing problems which began years of ENT care and several years of special speech classes. If that turns out to be the issue and you are in the Elgin area, I highly recommend Dr. Nikhil Bhatt ###-###-####).
BTW, there is hope. Within a month of his first 'tube' surgery, my son could hear and speak fine. He grew-up to be an intelligent young man, who is now an engineer.
Our grandson has had a simlilar history, as his uncle, and is showing simlar improvements, two years later.
You may want to get the toxins from cleaning products and personal care items out of the house. Check out this information:
http://www.livetotalwellness.com/bevk
Click on the "Learn More" and I will be glad to help you with that.
Good luck and God Bless.