I measured my son's head before ordering and received a large one (he measured 54 cm). He's 2.5 years old and has a larger than average head size (a family trait of mine) so I figured I'd be safer with a bigger one. The hat fits a little loose and is larger than I would choose if purchased from a store that could try on both sizes. I was planning to return it due to the smaller size but after finally fitting it to my son I decided the larger size would be better to cover most of his head on the back and sides as winter approaches. The hat itself is great and I love the charcoal gray with an orange tint as it goes well with most "boys" colored jackets. I will definitely buy in a different color but next time I will take a smaller size.
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