i am not sure how old he is... but I did note a few observations..
1. I think that is chocolate milk in his bottle.
2. judging by the way his right hand looks.... well.... I think you get my point
3. I'm pretty sure his left leg is a good foot shorter than his right..

It looks like a 6 month old baby's head on a 6 year old's body... weird. by the way, I own that exact stroller and my 9 week old son fits in it. that kid is WAY too big for that thing! lol..