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Our 3-year-old son likes cars, and he likes to arrange his toy cars in a line. Is this normal for toddler boys?
I had a friend whose son did the exact same thing. He played constantly with toy cars, and all he did was carefully line them up end-to-end.
I'm not sure if you had a specific concern, but I'd say it's not only "normal", but it's also fairly common.
It's a fairly normal thing, I'd say. My daughter spends ages every night ensuring that all her cuddly toys are in exactly the right position. Some kids simply like things to be just so.
Datapoint: mine do that too. It may be a symptom of toomanycaritis :)
Seems pretty normal to me.