Baby Clothes Size Chart
Convert baby clothing sizes between US, UK, and EU systems, or find the right size by weight.
This tool is for informational and educational purposes only. It is not a substitute for professional financial, medical, legal, or engineering advice. See Terms of Service.
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Baby clothing sizes vary significantly between US, UK, and European systems, and brands often size differently even within a country. This chart gives you a reliable starting point. Here is how to use it:
- Choose your lookup method. Select "Known Size" if you have a size label and want to convert it to another system. Select "Baby's Weight" if you know your baby's current weight and want a size recommendation.
- Enter your size or weight. For size conversion, choose the system the label is from, then select the size. For weight lookup, enter the weight in pounds or kilograms.
- Read all size equivalents. The results show the US, UK, and EU size, plus the typical age range, weight range, and height range for that size group.
Sizing tip: when in doubt, size up. Babies grow fast, and a slightly large outfit is far more practical than one that fits for only a week. Onesies and bodysuits with snap closures at the bottom tend to be less forgiving than sleepers with feet.
About Baby Clothing Size Systems
The US sizing system uses a mix of age ranges (Newborn, 0-3M, 3-6M) and year-based labels (12M, 18M, 24M, 2T). UK sizing is similar but uses different terminology. The European sizing system is metric-based: the number represents the child's height in centimeters (EU 50 = 50 cm tall, roughly a newborn). This makes EU sizing more precise and predictable than age-based systems, since two babies at the same age can differ significantly in size. All calculations run entirely in your browser.
Frequently Asked Questions
What is the difference between 24M and 2T baby clothes?
24M (24 months) and 2T (2 toddler) are very close in size but have a subtle difference. 24M is cut to fit a baby who is still in diapers, with a slightly wider seat and shorter rise. 2T is cut more like a toddler cut, with a slimmer fit. If your toddler is still in diapers when they reach this size range, 24M may be more comfortable. Most children transition through this size around their second birthday.
What does EU 62 mean in baby clothing?
EU 62 means the garment is designed for a baby who is approximately 62 centimeters tall, which typically corresponds to 0-3 months of age. European sizing uses the baby's height in centimeters as the size number, making it more consistent across brands than US age-based sizing. EU 62 is roughly equivalent to US 0-3M or UK 0-3 Months.
Should I buy clothes based on my baby's age or weight?
Weight is the more reliable measurement for sizing infant clothing, especially in the first 6 months. Babies on growth charts that are above or below the average for their age will often need a size that does not match their age label. For example, a 3-month-old who weighs 16 pounds would likely fit best in 6-9M clothing. After 6 months, height becomes increasingly important because longer babies need longer torsos and legs in their outfits.
Do I need Preemie size clothing for my newborn?
Preemie clothing is designed for babies under 5 pounds (2.3 kg). Most full-term newborns weigh 6-9 pounds and will fit into Newborn or 0-3M clothing at birth. Some larger newborns skip Newborn size entirely and go straight to 0-3M. It is usually best to wait to wash and cut tags until you know your baby's actual size at birth. If your baby is born early or on the smaller side, Preemie clothing will be necessary and is available at most baby stores.