Let him do experiments, learn animal facts, and go exploring! Also encourage him to study what he sees and take observations. Share stories of scientists who had questions and did exactly what he is doing! Now, still read him literature and poetry and have him listen to music. I had a son who never did learn to love this stuff, but he was exposed. He also if we were studying wildflowers, tended to measure all the petals and record them in his notebook instead of drawing them. OK, then! He DID learn to identify them. He did study them, come to know them. He still preferred snakes and experiments (especially the kind that made a boom) LOL DO NOT under any circumstances squash that inquisitive nature and curiosity!!!!! Harness it. Feed it. Give him as many stories about or books by naturalists as he can manage at this age. Have fun!