How to Read a Baby Clothing Size Chart: EU, US, UK and Asian Sizes Explained

Baby clothing sizing is one of the most common sources of confusion in international trade. A “6M” in the US is not always the same as a “6M” in the UK, and an Asian “80cm” may fit differently from a European “80cm”. If you sell across markets, you need to understand the differences — or risk returns, complaints and damaged brand reputation.

This guide explains the main size systems and how to compare them.

1. The Main Size Systems

• EU sizes — usually based on height in centimeters (e.g., 68, 74, 80).
• US sizes — usually based on age in months (e.g., 0–3M, 3–6M, 6–9M).
• UK sizes — similar to US, but often with different cut and fit.
• Asian sizes — usually based on height in centimeters, but often smaller than EU sizes.

2. Why the Same “Age” Fits Differently

Even when two charts both say “6–9M”, the actual garment can differ because of:

• Body measurements used by the brand.
• Fabric stretch and shrinkage.
• Cut and fit (slim, regular, loose).
• Local habits — some markets prefer looser fits.

Never rely on age alone. Always check height and weight ranges.

3. How to Compare Size Charts

When comparing charts, focus on these measurements:

• Height (cm or inches).
• Weight (kg or lbs).
• Chest and waist (for sets and outerwear).
• Inseam and sleeve length (for pants and long sleeves).

If a chart gives only age, ask the supplier for height and weight ranges.

4. A Simple Conversion Guide

Approximate conversions (always confirm with the factory’s actual chart):

• EU 68 ≈ US 3–6M ≈ UK 3–6M ≈ Asian 66–73cm
• EU 74 ≈ US 6–9M ≈ UK 6–9M ≈ Asian 73–80cm
• EU 80 ≈ US 9–12M ≈ UK 9–12M ≈ Asian 80–90cm
• EU 86 ≈ US 12–18M ≈ UK 12–18M ≈ Asian 90cm

These are rough guides only. Fit varies by style and brand.

5. What to Confirm with Your Supplier

• Which size system the factory uses by default.
• Whether they can produce according to your target market’s chart.
• Whether the chart is based on body measurements or garment measurements.
• Shrinkage rate after washing.

6. Common Mistakes

• Using age alone without height and weight.
• Assuming Asian 80cm equals EU 80cm.
• Not testing shrinkage before bulk production.
• Forgetting that different fabrics fit differently.

Final Thoughts

Size charts are not just a technical detail — they directly affect customer satisfaction and return rates. Confirm the chart with your supplier, test a sample, and publish clear size guidance on your website.

Need help building a size chart for your market? Contact us and we will provide a chart based on your target country and product style.