Baby Clothes Size Chart: How to Read Any Tag (and Why "2T" Isn't an Age)

You are holding a tiny onesie. The tag says 80. Or 2T. Or 9M. Your baby is seven months old and average-ish, and you have no idea if any of those numbers will fit. Welcome to one of the quietest, most universal frustrations of new parenthood: clothing sizes that seem to have been invented by three different countries who never spoke to each other.

Here is the good news. Once you know the trick, every tag becomes readable in a few seconds. The number is almost never your baby's age. It is usually their height or their weight, dressed up in a code. This guide gives you the full baby clothes size chart, decodes the European and Asian numbers like 70, 80, and 90, explains why "2T" is not the same as "24 months," and shows you the two-minute measurement that ends the guessing for good.

The quick answer

Most baby and toddler clothing sizes are based on height and weight, not the age printed on the label. The numbers on European and Asian brands (56, 62, 68, 74, 80, 86, 92 on European labels, or round tens like 60, 70, 80, 90, 100 on many Asian labels) are simply your child's height in centimeters. The US system (Newborn, 3M, 6M, then 2T through 5T) is loosely age-based but still keyed to weight and length. When in doubt, measure your child and shop by the number that matches their body, then size up.

The master baby and toddler size chart

This is the one to bookmark. It lines up the four systems you will actually run into: the rough age, your child's height, the European size (which is just that height in centimeters), the UK size, and the US size. Children grow at very different rates, so treat the age column as a loose starting point, not a promise.

Conversions based on the European baby and children's clothing size chart compiled by LiveAbout, which maps age ranges to height in centimeters and US sizes.

Why the number on the tag is not your baby's age

There are really three sizing languages on the market, and the reason they feel chaotic is that each one solves a different problem.

The European and most Asian systems label by height in centimeters. This comes out of a standard most parents have never heard of: the European size standard, EN 13402, which was designed to label clothes by real body measurements in centimeters instead of arbitrary numbers. For children's clothing, height is the primary measurement, and this height-based labelling has become the de facto norm for children's clothes across much of Europe. So a "80" is not a style code. It is a child who is roughly 80 centimeters tall.

The US system is loosely age-based: Newborn, 3 months, 6 months, then 2T, 3T, 4T. It is the friendliest to read and the least precise, because no two one-year-olds are the same size. As the LiveAbout chart puts it plainly, basing sizes on height rather than age is the more logical approach, because every three-month-old is simply not the same height or weight.

The UK system sits in between, using age bands like the US but with its own small differences. Once you accept that the age on any tag is a manufacturer's best guess, the European number actually becomes the most honest one in the drawer.

What the European and Asian numbers mean (60, 70, 80, 90, 100)

This is the part that trips up almost everyone shopping a gift from a European boutique or an Asian brand online. One quick note before the decode: European brands step in sixes (56, 62, 68, 74, 80, 86, 92), while many Asian brands use round tens (60, 70, 80, 90, 100). Only 80 appears in both. But the logic is identical either way: the number is your child's height in centimeters, with a little growing room built in. Here is the decode for the ones people search for most.

What size is 60 in baby clothes? About newborn to 3 months (roughly 56 to 62 cm tall).

What size is 70 in baby clothes? Roughly 6 to 9 months. A "70" fits a baby around 68 to 74 cm tall.

What size is 80 in baby clothes? Roughly 12 to 18 months. An "80" fits a child about 80 to 86 cm tall.

What size is 90 in baby clothes? Around 18 months to 2 years, for a child roughly 86 to 92 cm tall.

What size is 100 in baby clothes? Around 3 years (about 98 to 104 cm tall).

The pattern is simple once you see it: take the number, picture that many centimeters of height, and you have your answer. If you only remember one of these, make it 80, because it lands right in the busy 12 to 18 month window where parents buy the most.

What "2T" means, and why it is not the same as 24 months

The T stands for toddler. So 2T, 3T, 4T, and 5T are cut for children who are walking, climbing, and usually somewhere between one and five years old. This is the question that sends parents in circles, because stores sell both "24 months" and "2T," and they are not the same garment.

The difference is the diaper. According to Carter's explainer on how kids' clothing sizes work, 24-month pieces are often designed with extra room to fit over a diaper, while 2T pieces are cut for a child who may be potty training or already out of diapers. Same rough age, different shape. If your toddler is still in diapers, 24 months may fit more comfortably. If they are slimming out and potty training, 2T is usually the better cut.

And what does 4T mean in baby clothes? Same logic: a toddler cut sized for around a four-year-old, give or take, depending on your child's height and weight.

How to measure your kid in two minutes

This is the step that makes every chart above actually work. You need two numbers.

Height. For a baby who cannot stand, lay them down and measure in a straight line from the crown of the head to the bottom of the heel. The European standard measures children exactly this way, crown to sole, lying down for the little ones. For a toddler, stand them against a wall, mark the top of the head, and measure to the floor. That number, in centimeters, is your European size.

Weight. Step on a scale holding your child, then step on holding nothing, and subtract. US baby sizes lean heavily on weight, and baby clothing sizes are typically based on weight and length rather than age. If your child is in a higher percentile for height or weight, size up.

Write both numbers in your phone. Next time you are staring at a tag that says 80, you will not have to guess.

Should you size up? Almost always, yes

Here is the quiet math of dressing a small human: they grow out of the perfect fit faster than they grow into it. The LiveAbout guide says it directly, that buying a larger size is the smarter approach because kids are constantly growing. A piece that fits like a glove today is too small in eight weeks. A piece with a little room gets worn for months.

There is a fabric wrinkle worth knowing too. Natural fibers can shrink slightly in the first few hot washes, so with 100 percent cotton it is wise to assume a touch of shrink and lean to the larger size. At Hahaha, our tops are 100 percent GOTS certified organic cotton (certificate GOTS-CUC-03-TC-1033552), cut and sewn locally with our manufacturing partner Euphoric Colors in Downtown LA. Wash them cool and the fit stays closer to the fit you bought, and either way the size-up habit is a good one.

Sizing up also fits a buy-less way of shopping, which is the whole reason our tops are built around a swappable, collectible patch system. One well-made hoodie with room to grow, plus a few patches your kid swaps out, stretches further than a closet stuffed with pieces that fit for a season. One hoodie, many looks, fewer landfill-bound impulse buys.

How many clothes does your baby actually need?

Far fewer than the registry suggests. Babies grow through sizes in weeks, not years, so a giant stash of newborn pieces is the most common first-time mistake. A workable starting point for each size is roughly six to eight bodysuits or tees, four to six bottoms, a few sleepers, a couple of warm layers, and plenty of socks. Buy light in the smallest sizes, since most babies skip or blow through newborn fast, and put the savings into a few sturdy pieces in the 80 and 90 range that will get worn hard.

Frequently asked questions

What size is 80 in baby clothes?

Size 80 means roughly 80 centimeters of height, which fits most children around 12 to 18 months. In US sizing that lines up with the 12 to 18 month label. If your baby is tall for their age, treat 80 as closer to the 12-month end.

What does 2T mean in baby clothes?

The T stands for toddler, so 2T is cut for a child around two years old. The key difference from "24 months" is the diaper: 24-month pieces leave more room for a diaper, while 2T is shaped for a potty-training or diaper-free toddler.

What size is 70 in baby clothes, and what about 90?

Size 70 fits a baby roughly 6 to 9 months old (about 68 to 74 cm tall). Size 90 fits a child around 18 months to 2 years (about 86 to 92 cm tall). Both numbers are simply your child's height in centimeters.

Should I buy baby clothes by age or by weight?

By weight and height. The age on the tag is a manufacturer's average, and no two babies of the same age are the same size. Measure your child's height and weight, match the chart, and size up if they are in a higher percentile.

How many baby clothes do I need in each size?

A practical baseline per size is about six to eight bodysuits or tees, four to six bottoms, a few sleepers, and a couple of layers. Go light on newborn sizes, which babies outgrow quickly, and invest a little more in the 80 and 90 sizes that get the most wear.

Sizing systems and conversions vary slightly by brand. When a brand publishes its own size chart, check it against your child's measurements, since cut and fit can differ from the general ranges above.