T.T.
It sounds like he may be delayed, but PLEASE don't worry, it's more common than you think. Get an appointment with your ped. if you are unsure to see where your son should be at this age. My ped told me that they should be putting 2 words together and a stranger should understand 50% of what they say at 2 years. If your ped. thinks he is delayed call ECI. They know their stuff and I think you will be amazed at what they can do!!
We are currently in the process of evaluating our younger son b/c he is not clear (thanks to the help of a dear friend). My older son also had some issues, so I'm not new to the procedures (although we waited too long for ECI, which I regret). It's best to catch this stuff early, so give yourself a pat on the back for recognizing a potential problem!!
Good luck!!