Baby Shoe Size by Age & Foot Length
Find your baby's shoe size from age or foot length in cm. Instant chart with US, EU, UK and AR conversions for 0-24 months, plus how to measure correctly.
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Reviewed by: Martín Rodríguez (editorial policy ) · Last reviewed:
Result
Argentine Size
For a 12 cm foot: US 4, EU/AR 19, UK 3.5. Buy the shoe with ~1-1.5 cm of extra room so the toes can move.
European Size (EU)
US Size
Recommendation
See step-by-step calculation
For guidance only — not medical advice. Consult a licensed healthcare professional.
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Your result
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Picking the right shoe size for a baby is tricky: feet grow fast and every brand fits a little differently. Enter your baby's foot length in cm (the accurate way) or their age in months, and this calculator returns the matching size in the US, European (EU), UK and Argentine systems — plus how much growth room to leave.
When to use this calculator
- You're buying baby shoes and aren't sure which size to pick.
- You want to buy a gift but only know the baby's age, not the foot length.
- Your baby is taking first steps and needs their first proper pair.
- You need to convert a foot measurement in cm into US, EU, UK or AR sizes.
- You want to know how often to replace your baby's shoes.
Baby & Toddler Shoe Size Chart by Foot Length
| Foot length (cm) | Age (approx) | US | EU / AR | UK |
|---|---|---|---|---|
| 8–8.5 cm | 0–3 months | 0.5–1 | 15–16 | 0–0.5 |
| 9–9.5 cm | 3–6 months | 1–1.5 | 16 | 0.5–1 |
| 10–10.5 cm | 6–9 months | 2–2.5 | 17 | 1.5–2 |
| 11–11.5 cm | 9–12 months | 3–3.5 | 18 | 2.5–3 |
| 12–12.5 cm | 12–15 months | 4–4.5 | 19–20 | 3.5–4 |
| 13–13.5 cm | 15–18 months | 5–5.5 | 21 | 4.5 |
| 14–14.5 cm | 18–24 months | 6–6.5 | 22–23 | 5.5 |
| 15–15.5 cm | 2–2.5 years | 7–7.5 | 24 | 6.5 |
| 16 cm | 2.5–3 years | 8 | 25 | 7.5 |
| 17 cm | 3–4 years | 9 | 27 | 8.5 |
| 18 cm | 4–5 years | 10 | 28 | 9.5 |
Fuente: AAP (HealthyChildren.org) y SAP — Guía de calzado infantil. EU y talle AR son equivalentes en calzado infantil. Agregá ~1–1.2 cm de holgura al talón medido. Remedir cada 2–3 meses.
How it works
Baby & Toddler Shoe Size Chart (US / EU / UK / AR)
Foot length is the reliable signal — age is only an estimate because babies grow at very different rates. Match the measured foot length (heel to longest toe) to the row below.
| Foot length (cm) | Age (approx) | US | EU / AR | UK |
|---|---|---|---|---|
| 8–8.5 | 0–3 months | 0.5–1 | 15–16 | 0–0.5 |
| 9–9.5 | 3–6 months | 1–1.5 | 16 | 0.5–1 |
| 10–10.5 | 6–9 months | 2–2.5 | 17 | 1.5–2 |
| 11–11.5 | 9–12 months | 3–3.5 | 18 | 2.5–3 |
| 12–12.5 | 12–15 months | 4–4.5 | 19–20 | 3.5–4 |
| 13–13.5 | 15–18 months | 5–5.5 | 21 | 4.5 |
| 14–14.5 | 18–24 months | 6–6.5 | 22–23 | 5.5 |
| 15–15.5 | 2–2.5 years | 7–7.5 | 24 | 6.5 |
| 16 | 2.5–3 years | 8 | 25 | 7.5 |
| 17 | 3–4 years | 9 | 27 | 8.5 |
| 18 | 4–5 years | 10 | 28 | 9.5 |
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Cómo se calculan los talles
Los sistemas de tallas parten de la longitud del pie en distintas unidades base:
Conocer la fórmula evita confusiones cuando una marca muestra solo el sistema EU y necesitás convertir.
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Cómo medir el pie correctamente
1. Hacé pararse al bebé sobre una hoja de papel (si no camina aún, flexioná suavemente el tobillo a 90° para simular carga).
2. Marcá el talón y la punta del dedo más largo (no siempre es el primero).
3. Medí en cm; repetí en el otro pie y usá el mayor.
4. Sumá 1–1.2 cm de holgura para crecimiento y movimiento del dedo: ese es el largo interno mínimo del calzado que buscás.
> ¿Por qué de pie? Al apoyar el peso, el arco se aplana y el pie se alarga hasta ~5 mm más que en reposo. Medir acostado subestima el talle.
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Datos de crecimiento útiles
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Qué NO incluye esta calculadora
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Errores comunes al elegir talle
| Error | Por qué importa |
|---|---|
| Comprar "grande para que dure" más de 1.5 cm de holgura | El exceso de espacio hace que el pie resbale y dificulta el aprendizaje de la marcha |
| Medir el pie acostado | Puede subestimar el largo real hasta 5 mm |
| Usar el pie derecho por defecto | El pie dominante suele ser levemente mayor; siempre usá el pie más grande |
| Fiarse solo de la edad | A los 18 meses la variabilidad entre niños es de hasta 2 cm de pie, equivalente a 2–3 talles |
| Reutilizar calzado de hermanos muy usado | La suela desgastada asimétricamente puede alterar la pisada del siguiente niño |
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Referencias clave de talla
Example: a baby around 12 months old
Foot length measured heel-to-toe: 12 cm.
Look it up in the chart: EU 19.
Convert: US size 4.
Convert: UK size 3.5.
Argentine size: 19 (AR and EU match for kids).
For a 12 cm foot: US 4, EU/AR 19, UK 3.5. Buy the shoe with ~1-1.5 cm of extra room so the toes can move.
Disclaimer: Los resultados son orientativos y no reemplazan la consulta médica profesional. Antes de tomar decisiones con impacto, consultá con un médico, nutricionista o profesional de la salud matriculado.
Frequently asked questions
What shoe size does a 1-year-old wear?
Most 1-year-olds wear US size 4-5 (EU 19-20, UK 3.5-4.5), which matches a foot length of about 11.5-12 cm. Babies vary a lot, so measure the actual foot rather than relying on age alone.
How do I convert my baby's foot length in cm to a shoe size?
Measure the foot heel-to-toe in cm, then read across the chart: roughly, US size = EU size − 15 for infants. For example, a 12 cm foot is EU 19 / US 4 / UK 3.5. Always add about 1-1.2 cm of room before choosing.
When do babies need their first shoes?
Babies don't need shoes until they start walking (usually 9-15 months). Before that, socks or soft booties are enough, and going barefoot indoors is actually best for healthy foot development.
How do I measure my baby's foot correctly?
Stand your baby on a sheet of paper, mark the heel and the longest toe, and measure the distance in centimeters. Measure both feet, use the larger one, and add about 1-1.2 cm for fit. Measuring while the baby is asleep or in a high chair makes it easier.
How much room should there be in a baby's shoe?
Leave 1-1.5 cm between the big toe and the shoe tip (about a thumb's width). The shoe shouldn't pinch at the sides, and the baby shouldn't be able to kick it off too easily.
How often do babies outgrow their shoes?
Baby feet grow fast: about 1 cm every 3-4 months in the first year, then 1 cm every 4-6 months afterward. Check the fit every 2-3 months by pressing your thumb on the shoe's tip.
Are EU and US baby shoe sizes the same?
No. EU (and Argentine) sizes match each other for kids, but US sizes run about 2-3 numbers lower. A foot that's EU 19 is US 4. The US infant scale also restarts at "little kid 1" around a 16 cm foot.
What's the difference between baby and toddler shoe sizes?
Baby sizes typically run from newborn up to about 24 months, while toddler sizes start around age 2. Toddler shoes are slightly wider and have a bit more support as the foot develops and walking becomes more confident.
Are soft or rigid shoes better for babies?
For early walkers, soft, flexible shoes are best — they let the foot move and build strength. Save stiffer shoes for confident walkers. For learning to walk, barefoot or soft soles win.
Can I use hand-me-down baby shoes?
Only if they're in good shape. Check that the sole isn't unevenly worn, since worn soles can affect a baby's gait. If the size is right and wear is minimal, hand-me-downs are fine.
Sources & references
Methodology & trust
Editorial
Calculadora de salud revisada por el equipo editorial de Hacé Cuentas, contrastada con AAP (HealthyChildren.org) — Choosing shoes for children, según nuestra política editorial y metodología.
Updates
Última revisión: June 22, 2026. Los parámetros se verifican periódicamente con las fuentes citadas.
Privacy
Calculations run 100% in your browser. We do not store or transmit your data.
Limitations
Indicative results. For critical decisions, consult a professional.
📌 How to cite this calculator
Rodríguez, M. (2026). Baby Shoe Size by Age & Foot Length. Hacé Cuentas. https://hacecuentas.com/baby-shoe-size
Contenido bajo licencia CC-BY 4.0 — reutilizable citando la fuente con enlace a Hacé Cuentas.