Does the shoe still fit? How to tell when kids' shoes are too small

In short: children often don't notice when a shoe is too small. Watch for signs like complaints or toes hitting the front, but don't rely on them alone. Measuring foot length regularly is the safest way.

Why don't children notice?

Children's feet are soft and flexible. They adapt to a tight shoe, and young children can't yet reliably feel whether the foot fits well. That is why 69.4 % of preschool children in one study wore outdoor shoes that were too short.

Typical signs

• Your child complains, is in pain or doesn't want to put the shoe on anymore.
• The toes push against the front and curl up in the toe box.
• Red marks, pressure marks or blisters on the toes after taking the shoes off.
• Clear toe imprints at the front of the insole.
• Your child limps, walks on tiptoe more than usual or keeps taking the shoes off.
• The shoe is hard to put on.

How reliable is the thumb test?

For the thumb test you press on the front of the shoe and feel whether there is about a thumb's width of room in front of the longest toe. It is a good first check. But careful: children often curl their toes by reflex when pressed. Then the shoe feels bigger than it is. Experts, for example at the German health insurer BARMER, therefore consider the test unreliable on its own.

How to check it reliably

• Measure the foot length standing, heel against the wall, and compare it with the size chart.
• A shoe should be at least 10 to 12 mm longer inside than the foot.
• Measure regularly, at nursery age feet grow about 1 mm per month.
• Measure both feet, one is often slightly longer.
• Measure in the second half of the day, when feet are slightly bigger (BARMER).
• Insole check: take the insole out and stand your child on it. There should still be room in front of the longest toe. It helps as a check but doesn't show the full shape of the foot.

With Sizeless you simply move the shoe one colour further when the foot has grown, left and right separately. More: Adjustable kids' shoes.

Frequently asked questions

How much room do toes need in a shoe?

At least 10 to 12 mm more than the foot length inside (Klein et al. 2009). Other sources recommend 12 to 17 mm (KONSUMENT, BARMER).

How often should I measure?

Regularly, at least every three to four months. Young children's feet grow faster: between 1 and 3 years about 1.5 mm per month (Spektrum der Wissenschaft).

Is the thumb test enough?

As a first check yes, on its own no. Children often curl their toes when pressed, so the shoe seems bigger. Measuring is safer.

Sources:
Klein C, Groll-Knapp E, Kundi M, Kinz W: Increased hallux angle in children and its association with insufficient length of footwear. BMC Musculoskeletal Disorders 2009, 10:159. Link
Spektrum der Wissenschaft: Kinderschuhe oft zu klein (2023). Link
KONSUMENT (Verein für Konsumenteninformation): Kinderschuhe, zu klein geraten (2007). Link
BARMER Gesundheit im Blick: Gesunde Kinderfüße, passende Kinderschuhe finden (2018). Link
Kinderärzte im Netz (Berufsverband der Kinder- und Jugendärzte): Kinderfüße vor dem Schuhkauf messen lassen. Link