Kids Clothes Size Chart

Buying kidsā€™ clothes online should be simple, but inconsistent sizing often makes it frustrating. One brand fits, another doesnā€™t ā€” and with growth spurts and unclear standards, parents are left guessing. Because kidsā€™ sizes arenā€™t standardized, relying on age alone often leads to poor fit and clothes that donā€™t last.

This guide removes the guesswork with clear size charts, simple measuring tips, and practical advice to help you choose the right fit with confidence. Whether youā€™re shopping for everyday basics or planning ahead, itā€™s designed to help you find clothes that fit well and feel comfortable.

Anastasia Vasilieva
Anastasia Vasilieva Sustainable Fashion Entrepreneur
Kids Clothes Size Chart

Toddler Clothes Size Chart By Age

Toddler Size Age Range Height (in) Weight (lbs)
2T 2 years 33ā€“35 26ā€“30
3T 3 years 35ā€“38 30ā€“34
4T 4 years 38ā€“41 34ā€“38
Please note:

This size chart is a starting point. Individual fit preferences may vary. For best fit at time of purchase, use your childā€™s current measurements.

Kids Clothes Size Chart By Age

Kids Size Age Range Height (in) Chest (lbs) Weight (lbs)
4 2ā€“5 39ā€“42 23ā€“24 21ā€“22
5 5ā€“6 42ā€“45 24ā€“25 22ā€“23
6 6ā€“7 45ā€“48 25ā€“26 23ā€“24
7 7ā€“8 48ā€“51 26ā€“27 24ā€“25
8 8ā€“9 51ā€“54 27ā€“28 25ā€“26
10 9ā€“10 54ā€“57 28ā€“29 26ā€“27
Please note:

This size chart is a starting point. Individual fit preferences may vary. For the best fit at time of purchase, use your current measurements.

Related read: Baby Clothes Size Chart

How to Measure Your Child for Clothes

Accurate measurements are the foundation of good fit. Measuring at home only takes a few minutes and can save you from returns and frustration.

What You'll Need
  • A soft measuring tape (fabric, not metal)
  • A notepad or phone to record measurements
  • Your child wearing fitted clothing or underwear
Measurement Techniques

Height

Height
  • Have your child stand barefoot against a wall.
  • Make sure theyā€™re standing straight with heels together.
  • Mark the top of the head and measure from the floor to the mark.
  • Measure in the morning when children are typically tallest.
chest

chest

  1. Measure around the fullest part of the chest.
  2. Keep the tape parallel to the floor.
  3. Ensure the tape is snug but not tight.
  4. Your child should breathe normally.

WAIST

WAIST
  • Measure at the natural waistline (the narrowest point).
  • Keep one finger between the tape and the body.
  • Avoid pulling the tape tight.
HIP

HIP

  1. Measure around the fullest part of the hips and bottom.
  2. Keep the tape level all the way around.
  3. Check that the tape isnā€™t twisted in the back.

Inner Leg (Inseam)

Inner Leg (Inseam)
  • Measure from the crotch down to the ankle bone.
  • Have your child stand straight.
  • This measurement is especially important for pants and rompers.

Sizing Tips for Different Clothing Types

Tops (T-shirts, Shirts, Tank Tops)

Chest measurement is the most important factor for tops, followed by sleeve length. For layering, consider sizing up slightly, especially in colder months. Organic cotton tees should feel comfortable without being restrictive. Allow a bit of room for growth, but avoid excess fabric that can bunch or irritate.

  • $45.00
    2-3,3-4,4-5,5-6,6-7,7-8,8-9,9-10 years
    SELECT SIZE
    $45.00
    2-3,3-4,4-5,5-6,6-7,7-8,8-9,9-10 years
    LINEN BIRCH SHIRT IN SAND
    $45.00
    $45.00 $45.00
  • $26.00
    2-3,3-4,4-5,6,7,8,9 years
    SELECT SIZE
    $26.00
    2-3,3-4,4-5,6,7,8,9 years
    ORGANIC COTTON TANK, 2-PACK | DINOSAUR + SOLID GREEN
    $26.00
    $26.00
  • $34.00
    2-3,3-4,4-5,5-6,6-7,7-8,8-9,9-10 years
    SELECT SIZE
    $34.00
    2-3,3-4,4-5,5-6,6-7,7-8,8-9,9-10 years
    ORGANIC COTTON WILLOW TEE IN RIPE OLIVE
    $34.00
    $34.00 $34.00
  • $26.00
    2-3,3-4,4-5,6,7,8,9 years
    SELECT SIZE
    $26.00
    2-3,3-4,4-5,6,7,8,9 years
    ORGANIC COTTON TANK, 2-PACK | RAINBOW + STRIPED
    $26.00
    $26.00
  • $34.00
    2-3,3-4,4-5,5-6,6-7,7-8,8-9,9-10 years
    SELECT SIZE
    $34.00
    2-3,3-4,4-5,5-6,6-7,7-8,8-9,9-10 years
    ORGANIC COTTON WILLOW TEE IN TASSEL
    $34.00
    $34.00 $34.00
  • $34.00
    2-3,3-4,4-5,5-6,6-7,7-8,8-9,9-10 years
    SELECT SIZE
    $34.00
    2-3,3-4,4-5,5-6,6-7,7-8,8-9,9-10 years
    ORGANIC COTTON OAK TEE IN NAVAL
    $34.00
    $34.00 $34.00
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Bottoms (Pants, Shorts)

Focus on waist, hip, and inseam measurements. Adjustable waistbands are especially helpful for kids with slim waists or rapid growth. For younger toddlers, account for diaper bulk. Length matters for active kids, too short can restrict movement, while too long can be a tripping hazard.

  • $52.00
    2-3,3-4,4-5,5-6,6-7,7-8,8-9,9-10 years
    SELECT SIZE
    $52.00
    2-3,3-4,4-5,5-6,6-7,7-8,8-9,9-10 years
    LINEN OAK PANT IN TASSEL
    $52.00
    $52.00 $52.00
  • $42.00
    2-3,3-4,4-5,5-6,6-7,7-8,8-9,9-10 years
    SELECT SIZE
    $42.00
    2-3,3-4,4-5,5-6,6-7,7-8,8-9,9-10 years
    ORGANIC COTTON OAK PANT IN NAVAL
    $42.00
    $42.00 $42.00
  • $36.00
    2-3,3-4,4-5,5-6,6-7,7-8,8-9,9-10 years
    SELECT SIZE
    $36.00
    2-3,3-4,4-5,5-6,6-7,7-8,8-9,9-10 years
    ORGANIC COTTON BIRCH SHORT IN SAND
    $36.00
    $36.00 $36.00
  • $36.00
    2-3,3-4,4-5,5-6,6-7,7-8,8-9,9-10 years
    SELECT SIZE
    $36.00
    2-3,3-4,4-5,5-6,6-7,7-8,8-9,9-10 years
    ORGANIC COTTON WILLOW SHORT IN CANYON CLAY
    $36.00
    $36.00 $36.00
  • $42.00
    2-3,3-4,4-5,5-6,6-7,7-8,8-9,9-10 years
    SELECT SIZE
    $42.00
    2-3,3-4,4-5,5-6,6-7,7-8,8-9,9-10 years
    ORGANIC COTTON GINGKO PANT IN RIPE OLIVE
    $42.00
    $42.00 $42.00
  • $45.00
    2-3,3-4,4-5,5-6,6-7,7-8,8-9,9-10 years
    SELECT SIZE
    $45.00
    2-3,3-4,4-5,5-6,6-7,7-8,8-9,9-10 years
    LINEN OAK SHORT IN NAVAL
    $45.00
    $45.00 $45.00
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One-Piece Outfits (Rompers, Pajamas)

Torso length is key for one-piece garments. Too short can pull uncomfortably; too long can sag. For toddlers, consider snap placement for easier diaper changes. Organic cottonā€™s natural stretch helps with comfort, but for sleepwear, fit should be secure without being tight.

  • $40.00
    2-3,3-4,4-5,6,7,8,9 years
    SELECT SIZE
    $40.00
    2-3,3-4,4-5,6,7,8,9 years
    ORGANIC COTTON LONG-SLEEVE PAJAMAS | FLOWERS
    $40.00
    $40.00
  • $62.00
    2-3,3-4,4-5,5-6,6-7,7-8,8-9,9-10 years
    SELECT SIZE
    $62.00
    2-3,3-4,4-5,5-6,6-7,7-8,8-9,9-10 years
    ORGANIC COTTON BIRCH ROMPER IN SLEEPY BLUE
    $62.00
    $62.00 $62.00
  • $40.00
    2-3,3-4,4-5,6,7,8,9 years
    SELECT SIZE
    $40.00
    2-3,3-4,4-5,6,7,8,9 years
    ORGANIC COTTON LONG-SLEEVE PAJAMAS | WOODLAND
    $40.00
    $40.00
  • $62.00
    2-3,3-4,4-5,5-6,6-7,7-8,8-9,9-10 years
    SELECT SIZE
    $62.00
    2-3,3-4,4-5,5-6,6-7,7-8,8-9,9-10 years
    ORGANIC COTTON GINKGO ROMPER IN TASSEL
    $62.00
    $62.00 $62.00
  • $70.00
    2-3,3-4,4-5,5-6,6-7,7-8,8-9,9-10 years
    SELECT SIZE
    $70.00
    2-3,3-4,4-5,5-6,6-7,7-8,8-9,9-10 years
    MAPLE ROMPER IN CANYON CLAY
    $70.00
    $70.00 $70.00
  • $40.00
    2-3,3-4,4-5,6,7,8,9 years
    SELECT SIZE
    $40.00
    2-3,3-4,4-5,6,7,8,9 years
    ORGANIC COTTON LONG-SLEEVE PAJAMAS | SOLID GREEN
    $40.00
    $40.00
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Essentials & Accessories

Underwear sizing is typically waist-focused. Socks are usually sized by age or shoe size, while hats rely on head circumference. Prioritize comfort and stretch, especially for everyday essentials.

  • $40.00
    2-3,3-4,4-5,6,7,8,9 years
    SELECT SIZE
    $40.00
    2-3,3-4,4-5,6,7,8,9 years
    ORGANIC COTTON BOYS' BRIEFS MULTI-PACK | 5 COLORS
    $40.00
    $40.00
  • $14.95
    SELECT SIZE
    $14.95
    MENIQUE 95% MERINO THICK RIBBED WOOL KIDS' SOCKS IN LIGHT GREY
    $14.95
    $14.95
  • $29.00
    S,M,L
    SELECT SIZE
    $29.00
    S,M,L
    LINEN THREE-LEAF BUCKET HAT
    $29.00
    $29.00 $29.00
  • $40.00
    2-3,3-4,4-5,6,7,8,9 years
    SELECT SIZE
    $40.00
    2-3,3-4,4-5,6,7,8,9 years
    ORGANIC COTTON GIRLS' BRIEFS MULTI-PACK | 5 COLORS
    $40.00
    $40.00
  • $50.00
    US Baby 5-7.5,US Toddler 8-9.5,US Little Kid 10-12.5,US Big Kid 13-3
    SELECT SIZE
    $50.00
    US Baby 5-7.5,US Toddler 8-9.5,US Little Kid 10-12.5,US Big Kid 13-3
    LEELA COTTON 98% ORGANIC COTTON KNEE-HIGH KIDS SOCKS, 6-PACK | MINT GREEN
    $50.00
    $50.00
  • $40.00
    2-3,3-4,4-5,6,7,8,9 years
    SELECT SIZE
    $40.00
    2-3,3-4,4-5,6,7,8,9 years
    ORGANIC COTTON BOYS' BOXER BRIEFS MULTI-PACK | 5 COLORS
    $40.00
    $40.00
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Common Sizing Mistakes Parents Make

(And How to Avoid Them)

1

Buying based solely on age

Kids grow at different rates. Always check height and weight measurements.

2

Not accounting for growth.

Clothes may be outgrown quickly. Size up for long-term or seasonal items.

3

Ignoring fabric stretch.

Organic cotton has natural give; blends behave differently.

4

Measuring over bulky clothing.

This leads to inaccurate sizing. Measure in fitted clothes or underwear.

5

Not checking brand-specific charts.

A size 5 isnā€™t the same everywhere. Always review the brandā€™s chart.

6

Buying too small for a fitted look.

Restrictive clothing limits movement. Prioritize comfort.

7

Confusing toddler and kids sizes.

4T and size 4 are cut differently.

8

Forgetting about shrinkage.

Check care instructions and whether garments are pre-shrunk.

When to Size Up vs. Size Down

Size Up When:

  • Your child is near the top of the size range
  • Buying seasonal items meant to last
  • Your child is in a growth spurt
  • Purchasing gifts in advance
  • Layering is required
  • You prefer a relaxed fit

Size Down When:

  • Your child is at the lower end of measurements
  • Buying fitted items like underwear
  • Choosing organic cotton basics with stretch
  • Safety requires a closer fit (e.g., pajamas)
  • Your child is petite

When You're Between Sizes:

  • Prioritize the most important measurement
  • Check reviews for fit notes
  • Consider the season
  • Factor in potential shrinkage
  • Reach out to customer service with measurements

Seasonal Sizing Considerations

summer sizing

summer sizing

Opt for looser fits to improve airflow. Organic cotton helps regulate temperature and keep kids cool. Consider slightly longer shorts or tees for sun coverage.

winter sizing

winter sizing

Leave room for layers, especially in tops and pants. Sleeve and leg length matter for warmth. Organic cotton works well as a soft base layer.

transitional seasons

transitional seasons

Choose versatile pieces that layer easily. Medium-weight fabrics and flexible fits allow for temperature changes.

Growth Spurts: What to Expect by Age

Growth patterns vary, but ages 2ā€“3 often see rapid changes, ages 4ā€“6 tend to be steadier, and ages 7ā€“10 can vary widely before puberty. Most kids stay in a size for about 3ā€“6 months.

Signs itā€™s time to size up include sleeves or pants becoming short, snug waistbands, or restricted movement. Planning ahead by buying one or two staples in the next size can help. Investing in durable basics allows clothes to last through multiple children or hand-me-downs.

Explore Multi-pack kids bundles

Sizing for Special Circumstances

Tall or Petite Children

Length measurements matter most. Look for adjustable waists and cuffs to customize fit.

Children with Sensory Sensitivities

Soft, tag-free organic cotton can reduce irritation. Prioritize comfort over appearance and look for seamless construction.

Learn More About sensory clothing for kids

Active or Athletic Kids

Allow extra room in hips and thighs. Stretch and durability are important for high-movement play.

Frequently Asked Questions

It varies by brand. Treehouse Kids follows standard US sizing.

When measurements approach the upper range or clothes appear short.

Refer to the size up vs. size down guidance and consider the garment type.

Minimal shrinkage if pre-shrunk; follow care instructions.

No. Kidsā€™ proportions differ through ages 10ā€“12.

More Helpful Guides for New Parents

Organic Cotton Onesies: A Practical Guide to Comfort, Safety, and Everyday Wear

The Hidden Disadvantages of Synthetic Fibers

Best Fabric for Eczema