IDK... I think it is a unique gift but I'm not sure my child would play with it that much at the house. I do like the idea of taking it on road trips so if they travel much then yes I think it is a good idea.
I got one of those for my cousin (she was 3 at the time) last Christmas, and she was a little young for it, but her older sister (8 at the time) LOVED it. So much that I sent her another one for her birthday. I think they are great for playing with in the car, or at the grocery store.
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Re: Christmas idea for a 4 year old...