Educational gift for kids: Muse Magazine. (See the amazon reviews of the mag , but they say ordering directly through the magazine’s site is faster). It’s a no-ads mag with articles about science and culture.
As for things not to buy for little kids, don’t buy your child a telescope! Buy him a good star chart and binoculars instead. (Here’s another guy that agrees). This and this are apparently the best astronomy books for people beginning stargazing.