We bought this for our thirteen month old and it fits him perfectly. To give you an idea of size, at his doctor's appointment last month his head circumference was 18.5 inches (74th percentile). I would say he could have had a slightly smaller head and still be fit. He also has room to grow; I suspect he'll wear it until he's at least two and a half, maybe three. I'm actually a bit jealous of this helmet - it's so much better than mine. It's really easy to adjust, so each time we take it off we loosen it (using the dial on the back) and tighten to make sure it's snug when tightening. The straps are easy to adjust too, but he can easily pull them off his chin because he's still a bit chubby. I'm not sure if a helmet would be better. He wasn't a big fan of it the first time, but got used to it the second time. Now he likes to play with the air vents and feel the texture change between the plastic and styrofoam. It suits him very well too. The colors are much brighter than I expected from the photos and the sun visor is the perfect size. He also looks big enough to cover his nose the next time he hits the plants by jumping over his bike's handlebars. We are very happy with this purchase and glad his little head is safe.
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