I'm a little concerned that my 22 month old ds is not at all interested in painting, drawing, playdough. If i offer him a crayon he bats it away (actually he does that with quite a few toys, his interest is fairly limited ie cars, trains, bricks). He has about 20 words, mostly animals, which might not sound much but is about the same level his elder brother was at, at same age, and you can't stop him talking now). He loves books, songs, peek a boo and is a good runner. Should i be concerned?