How to Measure a Baby's Foot Accurately
Babies' feet grow 2-3 shoe sizes in their first year. The measurement is easy; keeping up with it is the work. Here's the technique for pre-walkers, new walkers, and confident walkers.
Step-by-Step (Pre-Walkers)
- Calm baby first. Full belly, dry diaper, alert-not-fussy. Bath time is a good window — feet are warm and relaxed.
- Lay baby on their back. Pre-walkers measure best lying down with the leg straight.
- Place foot on paper. Gently flatten the foot against an A4 sheet. Hold heel and ball of foot lightly — babies curl toes by reflex (plantar grasp).
- Mark heel and longest toe. Soft pencil, perpendicular to paper. The longest toe is often the second toe in babies.
- Measure in mm. Repeat on the other foot.
Step-by-Step (New Walkers, 9-15 Months)
- Tape paper to the floor. Hold child's hand for support if needed.
- Stand baby on the paper. Both feet, full weight. Heels back against a wall or chair.
- Mark heel and longest toe quickly. 5-10 seconds of standing is usually all you get.
- Measure both feet. Use the larger foot for sizing.
Baby Foot Length by Age
| Age | Foot length | US Kids | UK | EU |
|---|---|---|---|---|
| 0-3 mo | 85-95mm | 0-1 | 0-0.5 | 16 |
| 3-6 mo | 95-105mm | 1-2 | 0.5-1 | 16-17 |
| 6-9 mo | 100-108mm | 2-3 | 1-2 | 17-18 |
| 9-12 mo | 105-115mm | 3-4 | 2-3 | 18-19 |
| 12-15 mo | 110-120mm | 4-5 | 3-4 | 19-20 |
| 15-18 mo | 115-125mm | 5 | 4 | 20-21 |
| 18-24 mo | 120-135mm | 6-7 | 5-6 | 22 |
Wide ranges — your baby may be at the low or high end. Always measure the actual foot.
When Do Babies Need Shoes?
Pre-walkers (0-9 months typically)
New walkers (9-15 months)
Confident walkers (15+ months)
Re-Measure Schedule
Common Mistakes
Measuring with toes curled
Plantar grasp reflex curls baby toes when something touches the sole. Hold the foot flat gently — don't force, but flatten enough to mark accurately.
Buying shoes too early
Pre-walkers don't need shoes. Booties and socks until walking is established (9-15 months).
Sizing way up for growth
One size up is fine; two is not. Big shoes cause tripping in early walkers. Replace every 2-3 months instead.
Buying stiff-soled adult-style shoes too early
Hard soles inhibit muscle development under age 2. Flexibility-first.
FAQs
Do babies need shoes before they walk?
No. Soft booties or socks are better. Save shoes for confident outdoor walking.
How do I measure when toes keep curling?
Gently flatten the foot. Don't force; wait for the plantar grasp to relax.
What size shoe does a 12-month-old wear?
Average 108mm foot = US Kids' 4 / UK 3 / EU 19. Variation is wide.
How fast do babies' feet grow?
~0.5mm per month in year one. ~1mm per month in toddlerhood.
Soft-soled or hard-soled shoes?
Soft for pre-walkers and new walkers. Flexibility-first under age 2.
Are baby shoe sizes the same as toddler sizes?
Same scheme (US 0-13.5), different ranges. Big-kid 1Y starts around age 6+.
One Tracing Per Month, Right-Size Shoes Always
Take 60 seconds with a sheet of paper, file the date and the measurement in your notes app. By month three you'll be predicting growth before it outpaces the shoe.
For more on kids' shoes see our kids' shoe chart; for older kids, how to measure children's feet.
Selling baby shoes on Shopify? Help parents pick the right size.
Tailor Size Guide adds foot-length matching to every baby and toddler shoe — converts mm to US/UK/EU/JP automatically.