Quoting Kristen Parris:" See that's what I'm afraid of, but I just don't think it is because he doesn't do it all the time and ... [snip!] ... to sit back and see peoples reactions and study them and he is a little bit quieter but he loves to snuggle with me and play.."
It's probably nothing, and the first thing I would do is maybe just go get his eyes checked. Maybe his vision is a bit off, so certian combos of light/darkness/near/far make things hard to see.
Autism is a possiblity, but I wouldn't jump to it. My son had great eye contact at that age, loosing it more around 18 months. He was very social and had great emotion. Right from day one he wanted to face out to see the world, I always joked that he just wanted to be a part of everything. He was dx with autism at 3. Just not having eye contact alone is not a sure sign, but I would get his eyes checked if I were you.