his attention span has not grown yet. just give him time. and if he likes cetrian cartoons buy things that have that character on it. when you buy a item you should also show him several times how it works and play with him or her. When my son was small his most favorite toy was a plastic car that he could take apart and put back together. the cheapest toy out of all i had bought. Cost me one dollar at walmart. I showed him how he could roll it into the wall and that was all it took. just take him to toy store also and see what catches his attention.