Amber,
Children generally acquire their first word at around 12 months. I could give you a list of what most children do by age two if you'd like. When you say your son babbles, can you tell me how many different consonants and vowels he's using? Is it always dada, or just da, or can he say things like baba (not in reference to anything, just make the sounds). I would definately have a full hearing test by a licensed audiologist first and go from there. Just because he can hear the television doesn't mean he can discriminate speech sounds.
Please don't ignore this. There are studies that say that language ability is an even greater predictor of school success than IQ.
When you have decided what you believe, ...have the courage to stand alone and be counted.