Children's bike helmets 2026: the rules, sizing and what the tests say

For a child, a helmet is the first piece of cycling kit worth getting right. In the UK it isn't a legal requirement; in France it is, up to the age of 12. Either way, what remains to decide is which one, what size, and how to adjust it so it genuinely protects. That's also where independent tests are most useful, because children's helmets sell largely on their graphics.

For the basics common to all bike helmets (standards, MIPS, lifespan), see our guide to choosing a bike helmet.

What the law says: UK and France

Two points that matter if you ride in France. The helmet must be fastened: a helmet perched on the head with the strap open doesn't count, and doesn't protect. And the requirement also applies to a child passenger, on a rear seat or in a family cargo bike, even when the parent is pedalling.

In the UK, the absence of a law doesn't change the advice: a fitted helmet is the simplest protection you can give a child on a bike.

The standards on the label

• EN 1078 (BS EN 1078): the bike helmet standard, children's helmets included. That's the one to look for on the inside label.
• EN 1080: a standard for very young children, with a strap designed to release under a given load, to limit the risk of strangulation if the helmet gets caught. It's found on some small-size helmets.

Whatever the standard, one simple safety rule: take the helmet off to play, in a playground or up a tree. A bike helmet isn't designed for that, and a trapped strap is a real danger.

What the tests say: April 2026, ADAC and Stiftung Warentest

The most recent published test of children's helmets is by the German motoring club ADAC and Stiftung Warentest (Germany's equivalent of Which?), published in April 2026. Eighteen helmets for children aged 2 to 12, lab-tested for crash protection, tested with children for handling and comfort, and analysed for harmful substances.

The testers also noted a recurring trade-off: the most protective helmets were less comfortable, and the most comfortable less visible in poor light. And, as so often, the most expensive isn't the best: the top-ranked helmet is one of the cheapest in the test.

This is a German test: some models aren't sold in the UK, and Lidl's range varies by country and over time. Above all, keep the method: check how the strap holds, temple coverage and visibility.

Choosing the right size

A helmet that's too big "so it lasts two years" is a classic mistake: it tips in an impact and exposes the forehead. Size is chosen on the current head circumference.

1. Measure the head with a soft tape measure, a finger's width above the eyebrows, around the widest part of the back of the skull.
2. Choose the size whose range covers that measurement, ideally in the middle of the range, to keep some adjustment margin.
3. Try it on the child: the helmet should sit without forcing, then be tightened with the rear dial.

Children's sizes generally cover small heads (around 45-50 cm for the youngest) up to near-adult sizes around age 10-12. Each brand has its own breakdown: trust the manufacturer's chart, not the age on the box.

Fitting in 4 checks

The fault found on the Melon Urban-Active (a strap that slackens with use) shows why this check should be repeated regularly, not just on the day you buy it.

The criteria that matter for a child

• Visibility: reflective strips, a light colour, an integrated rear light if possible. It's one of the areas where the April 2026 test made a difference.
• Back of the helmet: for a child carried on a seat, choose a shell with a flat or barely protruding back, so it doesn't push the head forward against the seat back.
• Ventilation and weight: a heavy, hot helmet comes off the moment your back is turned.
• Peak: useful against the sun, provided it's flexible and doesn't block vision.
• Buckle: a magnetic or easy-to-use buckle helps the child put it on alone, and avoids pinching the skin of the neck.

When to replace the helmet

• After any impact, even with no visible crack: the foam may be crushed and won't protect the same way.
• When the head has grown: if the dial is at its limit or the helmet rides up on the forehead.
• After a few years of use, as the manufacturer recommends, even without a fall: sun and sweat age the materials.

A second-hand children's helmet isn't recommended: you don't know its history.

Our verdict

• Most important: a helmet in the right size, properly adjusted, worn on every ride. A well-fitted £15 helmet protects better than an £80 one that's too big.
• If the model has been tested: prefer a helmet well rated for protection, and check the strap holds.
• For a passenger: flat back and easy fastenings.
• For a schoolchild: visibility first, a light and reflectives.

The same reasoning applies to the accompanying adult: see our urban bike helmet comparison. If you're looking for a bike to carry the children, also see our comparison of 2026 city bikes.

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Does your child's bike need its brakes adjusting, the saddle raising or a chain that keeps jumping sorted? Ask the assistant.