From my experience, with my own kids and from knowing other parents, I'd say normal at this age can be anything from quite a bit of solids (my DD2 nursed avidly at that age, but also had a big appetite for solids, and some days ate more than my then-three-year-old) to nothing at all. (DD1 at that age barely ate one mouthful of solid food in an average day.)
I wouldn't worry about it, at all. He'll eat when he's ready, and in the meantime he's getting just what he needs from your milk. Just keep offering, in an offhand way, you know? I think when we make too big a thing out of food, even in a positive way, they can get balky about it. And make sure of course that you continue to offer only good healthy choices.
me , he , my three , , and -- and the one we lost