Baby Size 70, 80, 90 Explained: European Sizing for US Parents

You ordered the cutest romper online, the tag says “80,” and now you're wondering if it will fit your 10-month-old. That’s European baby sizing for you.

The numbers don’t follow the usual age labels most parents are used to, which is where the confusion starts. But once you understand how these sizes work, shopping becomes much easier. Let's walk through what sizes 70, 80, and 90 actually mean, how to convert them, and how to make sure whatever you buy fits.

How European Baby Sizing Works

US baby clothes use age ranges like "3 to 6 months" or "12M." European brands skip age entirely and label by height in centimeters.

A size 70 means the garment fits a child up to 70 cm (about 27.5 inches) tall. Size 80 fits up to 80 cm (about 31.5 inches). Size 90 fits up to 90 cm (about 35.5 inches). The measurement your pediatrician records is the same number you'll use for European sizing.

European to US baby size conversion chart:

Age ranges are approximate. Your baby's actual height determines the best fit.

What Is Baby Size 70?

Baby size 70 fits infants up to 70 cm (27.5 inches) tall. In US sizing, that's roughly equivalent to 6 to 9 months. Most babies reach 70 cm somewhere between 6 and 9 months. At this stage, your baby may be sitting up, starting to crawl, and putting everything in their mouth.

Clothes in size 70 should allow room for movement without excess fabric. A breathable organic cotton onesie works well for active babies at this stage. Pairing it with a soft muslin swaddle blanket that doubles as a play mat or stroller shade gives you versatile coverage as your baby explores.

What Is Baby Size 80?

Size 80 baby clothes fit children up to 80 cm (31.5 inches) tall, which generally corresponds to US size 12 to 18 months. Babies wearing size 80 are often cruising along furniture, starting to walk, or already running you ragged. 

Durable, stretchy fabrics matter more now than during the newborn phase. Soft ribbed cotton pajamas with a snug fit are practical for active little ones. A 2-in-1 burp cloth and bib combo handles the mealtime messes that come with this stage.

What Is Baby Size 90?

Size 90 in baby clothes fits toddlers up to 90 cm (35.5 inches) tall. In US sizing, that aligns with approximately 2T. At this height, your child is firmly in toddler territory. 

Clothes need to handle running, climbing, independent eating, and outdoor play. A cozy plush throw blanket in a generous 60x80 inch size grows with your toddler from nap time to movie nights for years.

Tips for Shopping for European Baby Sizes

Buying from European brands doesn't have to feel like guessing. A few habits make the process easier:

• Measure your baby's height first: Lay them flat and measure from head to heel in centimeters for the most accurate match.
• When between sizes, go up: Babies grow fast, and a slightly roomy fit gives you more wear time.
• Check the brand's specific chart: European sizing is more consistent than US sizing, but individual brands still vary.
• Save measurements on your phone: Update every month or two, so you're always ready to shop.
• Focus on height, not age: Two babies born on the same day can be very different heights by 6 months.

Finding the Right Fit

Sizing labels can guide you, but your baby’s measurements matter most. Paying attention to their height makes it easier to choose clothes that fit well and last longer, no matter where you’re shopping from.

Browse our sleepwear collection and swaddle collection to find soft, beautifully designed pieces that fit your little one just right.

FAQs

What is size 80 in baby clothes?

Size 80 fits babies up to 80 cm (about 31.5 inches) tall. In US terms, that aligns with 12 to 18 months. Many babies reach 80 cm somewhere between 9 and 18 months, depending on their growth pattern.

What is size 90 in US baby clothes?

Size 90 in European baby clothes corresponds approximately to US size 2T. The garment is designed for toddlers up to 90 cm (about 35.5 inches) tall, typically between 2 and 3 years old.

How do I convert European baby sizes to US sizes?

European sizes represent your child's height in centimeters. Measure your baby from head to heel, then match that number to the European size chart. Size 70 equals roughly 6 to 9 months, size 80 equals 12 to 18 months, and size 90 equals 2T in US sizing.

Should I size up when buying European baby clothes?

Yes. If your baby falls between two sizes or is close to the upper limit of a size, choosing the larger option gives you more wear time. Babies grow quickly, and a slightly roomy fit is more comfortable than clothing that's outgrown within weeks.

Why do European brands use centimeters instead of age?

European sizing is based on height because babies of the same age can vary significantly in size. A height-based system provides a more accurate fit than age-based labels, which is why many parents prefer it once they understand how the numbers work.