A quick plug for some good friends of mine. Jeeto! is a Los Angeles based family-run business specializing in very cool fine art and clothing for infants and toddlers. The lobby of our school in Tokyo is decorated by their great, timeless canvases, and they really make the room.
If you know any kids with severe allergies, definitely check out their allergy line...patches, t-shirts, and stickers that make caretakers aware of your child's allergies. I know it's a cliche, but these make great, incredibly thoughtful gifts.
If you happen to be in Tokyo, from Saturday you'll be able to find Jeeto! clothing at the brand new Stomp Stamp store at Roppongi Hills, just in front of the Asahi Television Building. Stop by and ask for Jeeto! For a list of stores in the U.S., check here.