A.A.
You can take him to the 2D version... that is what we do. The glasses are always a trainwreck for us. I think my daughter was about 2 1/2 when we took her to her first movie. She talked quite a bit and we kept having to tell her over and over to be quiet. Otherwise, she did just fine. Just one warning... we went to see it last weekend. Don't want to spoil anything for you, but there is a scene towards the end where the whole gang is at the landfill heading towards a fiery incinerator. Basically the idea is that they're all going to "die" together. This scene scared the living daylights out of my 4 year old. Since then, she has been very concerned about the garbage and where it is going and if it's going to go through fire. This might not be a big deal for a a two-year-old though.