Kids' Clothing Size Guide: Charts, Measurements & Tips for Parents

Why do children’s clothing sizes never seem to be right? For an adult, they just don’t make sense. What does size 4T really mean? Why do the sizes seem to be all different, instead of all the same?

We know that kids’ clothing size charts can be quite overwhelming. The sizes seem like a mess, you may even panic about it a little bit, and we completely understand why. But the thing is, this stage will last a while, because your child will constantly grow. So first, you will shop for a toddler, then a child, and finally – a preteen. With that said, you'd better get used to the kids’ clothing size charts sooner rather than later. 

That’s why we created this guide for you today. We can help you understand the kids’ size charts by age and never have to worry about shopping for your child again. It seems like no two brands have the same sizes, and we will clear the air on that.

Let’s go through this together.

Age-Based vs Measurement-Based Sizes

Most kids' clothing sizes are based on age ranges (like 2T, 4, 6X, 10-12), but not all kids fit the average mold for their age. That’s why you need to be smart when you shop and thoroughly understand the kids’ size charts by age.

• T Sizes (2T–5T) - The T stands for toddler.

• Numeric Sizes (4–16) - These are for older kids (e.g., size 4 = age 4, size 6 = age 6).

• X Sizes (like 6X) - The X typically means a little more length or width than the standard size.

• Youth Sizes - As kids grow, brands often shift to youth sizes (small, medium, large, XL)

Each brand also interprets these ranges differently. This is why you see slightly different fits, no matter what the label is, even when two brands use the same numbers.

Tips for Measuring Kids at Home

Measure your child. This is the most reliable way to find the perfect fit, and it’s easier than you think. You need a measuring tape, a notepad, your child, of course, and you’re good to go! Here’s how to get the key measurements:

• Chest - The maximum perimeter measurement under the armpits with the tape passing over the shoulder blades and across the chest or bust. 

• Waist - The measurement of the natural waist perimeter measurement with the child's abdomen relaxed. 

• Hip - The horizontal measurement taken round the fullest part of the bum.

• Inseam - The measurement taken from the crotch to the ankle bone of the feet.

• Height - Measure from the top of the head to the soles of the feet while standing straight with feet together.

If you're shopping for dancewear, it's also important to measure the girth—wrap the tape measure from one shoulder, through the crotch, and back up to the same shoulder. This helps ensure the best fit for leotards and costumes.

Write these numbers down and keep them handy when you shop. It will help you match your child’s measurements to the kids' size chart (for every brand).

Leave Some Room to Grow

We all know kids don’t grow predictably - they shoot up overnight! Because you are aware of that, here are a few tips to keep in mind:

• Leave room - If your child is near the top end of a size range, consider a size up, especially for outerwear, jeans, or items you want to last.

• Stretchy fabrics help - For leggings, tees, and knits, a snugger fit is fine since there’s more give.

• Shop seasonally - Buy slightly bigger sizes for clothes meant to last through next season.

A solid kids' size chart by age can also help predict what size your child may grow into next.

How We Handle The Sizes

We know that fit matters, especially when it comes to the youth size chart. That’s why we put extra care into everything. We make sure our sizes are clear and consistent. Here’s how we support you. 

Each product page includes a detailed kids' size chart tailored to that specific item. Because a ballet leotard does not fit the same as a cardigan, right? On top of that, our fit process includes real children of all sizes and ages. You can trust that our size suggestions match real-life proportions.

Not sure which size to choose? Don’t worry—we’re here to help. Our support team is happy to offer personalized guidance, especially if you're shopping for a unique body shape. 

You want to shop for your child, but you don’t want to be faced with the constant challenge of numbers – we get it. Once you understand how the clothing sizes work, know how to measure your child, and check each product’s kids' size chart, everything becomes so much easier. It’s even kind of fun!

At Stelle, our mission is to help parents like you feel confident about every purchase. With a consistent size system and a team ready to support you, you’ll never feel unsure about what to add to your cart.

FAQs - Kids’ Clothing Sizes

      1. How do I know if my child is between sizes? 

If your child’s measurements fall between two sizes on a kids' size chart, think deeper. For looser-fitting items like tops or dresses, you can size up, that’s no problem. But for snug items like leotards or leggings, stick with the smaller size if you are not so sure. Also, think about how soon your child might grow. Does it seem like they will outgrow the smaller size quickly?

     2. Should I size up if I want it to last longer? 

In many cases, yes, especially for coats, pajamas, or anything seasonal. But for performance wear like dance clothes, a proper fit is key. For example, a ballet leotard that’s too big can affect movement and comfort. Our advice: always refer to the individual size chart or product-specific guide to make the best call.

     3. What if my child is very slim or tall for their age?

More often than not, kids fall outside the standard range. That’s why we recommend you use actual measurements. Don’t just shop by age. Here’s what we mean by that:

• Slim kids - look for adjustable waists or stretchy materials

• Tall kids - prioritize longer inseams or sleeve lengths

Now that you’ve got a better handle on kids’ clothing sizes, you might be wondering about specific items like dancewear or shoes. For ballet shoes in particular, getting the right fit is just as important—so we’ve put together full guide on How to Measure and Fit Ballet Shoes for Kids to help!