Children's bike helmets

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I know they need replacing after an accident but do they need replacing after your stroppy 4 year old has thrown it across the kitchen?

And while you are here, can you get a helmet for a 3 year old?

I got one of these for my two-year-old. I think it is the smallest size they tend to come in and it adjusts beautifully. It also comes in pink. It states it is for aged 5 and over but I think it would already be a bit snug for my four-year-old.

Don't know if you need to replace your stroppy LO's helmet though.

Thanks.

I will check in the shop.