Kids Shoe Size 3C Guide & Conversion
Complete fitting specifications for children's US Size 3C. Fits foot lengths up to 10.0 cm (3.94 inches), typically worn by children around 6–9 months.
Quick Answer (Size 3C):
A child's US Size 3C shoe fits a maximum foot length of 10.0 cm (3.94 inches), matching UK 2 and EU 18. Recommended shoe interior length is 11.2 cm to provide 10–12 mm of orthopedic growing room for 6–9 months.
Size 3C Dimension & Conversion Matrix
Calibrated to pediatric footwear standards with 12 mm orthopedic allowance
Max Foot Length
10.0 cm
100 mm / 3.94"
Shoe Interior Room
11.2 cm
112 mm (+12mm room)
UK & India Size
UK 2
India / SA Size 2
European Size
EU 18
Continental Europe standard
Comparative Sizing Steps (Adjacent Steps)
Step Interval: ~4–8 mm| Size Step | US Size | Foot Length | Shoe Interior | UK / EU | Page Link |
|---|---|---|---|---|---|
| Step -1 (Smaller) | 2C | 9.2 cm (3.62") | 10.4 cm | UK 1 / EU 17 | View Size 2C → |
| Current Target | 3C | 10.0 cm (3.94") | 11.2 cm | UK 2 / EU 18 | [This Page] |
| Step +1 (Larger) | 3.5C | 10.4 cm (4.09") | 11.6 cm | UK 2.5 / EU 18.5 | View Size 3.5C → |
Pediatric Fitting & Podiatry Guidance (Size 3C)
Biomechanical shoe construction advice for 6–9 months
Developmental Milestone
Crawling, Pulling to Stand & Toe Gripping
At this developmental stage, foot cartilage and nerve endings are actively forming. Non-restrictive toe boxes prevent bunions and hammertoes.
Shoe Construction Buying Advice
Babies grip the floor with their toes when pulling up. Avoid thick rubber outsoles that alter natural balance. Choose lightweight, thin leather soles with grip texture.
How Major Brands Fit in Size 3C
Nike & Jordan (3C)
Runs SnugNike and Jordan kids models use athletic lasts that taper at the forefoot. If your child's foot measures over 97 mm or they have a wide instep, consider sizing up to 3.5C.
Nike Size Guide →Adidas (3C)
True to SizeAdidas provides a rounded, anatomical toe box that accommodates natural splay. Check their removable Adifit insole to confirm your child's toes stay within the marked border.
Adidas Size Guide →New Balance (3C)
Wide Fits AvailableNew Balance offers dedicated Wide (W) and Extra-Wide (XW) widths in size 3C. Ideal if your child has chubby toddler arches or requires custom orthotics.
New Balance Guide →Stride Rite & Crocs
Roomy FitStride Rite builds with sensory soles and multiple widths. Crocs uses whole sizes; if your child is between sizes, always round up to prevent the pivoting heel strap from pinching.
Stride Rite Guide →Buying Gifts or Sharing with Family?
Never get sent the wrong shoe size again. Share your child's exact size 3C measurements directly with grandparents, co-parents, or friends on WhatsApp:
Browse All Kids Shoe Sizes
Frequently Asked Questions About Size 3C
Helpful fit allowances, measuring wisdom, and sizing advice for parents.
What age wears a size 3C kids shoe?
Size 3C children's shoes are typically designed for 6–9 months. Because children develop at different rates, measuring exact foot length in millimeters or centimeters is far more reliable than relying solely on age.
How long is a size 3C foot in inches and centimeters?
A size 3C kids shoe fits a maximum foot length of 10.0 cm (3.94 inches, or 100 mm). The actual inside cavity of the shoe should measure approximately 11.2 cm to provide recommended orthopedic wiggle room.
What is size 3C in UK and EU kids sizes?
A US kids size 3C corresponds to UK size 2 and European size EU 18. In the international Mondopoint system, this matches a foot length of 100 mm.
How much wiggle room should be in a size 3C shoe?
Pediatric podiatrists recommend 10 mm to 12 mm (roughly 0.5 inch or a full thumbnail width) of clear space between your child's longest toe and the front of the shoe to prevent cramped toes and encourage healthy foot bone formation.