Quick answer

Start by measuring your child's chest, height, and current clothing size, then decide whether you want a snug athletic fit or a roomy relaxed fit. For zip-up hoodies, size up if your child is between sizes so the zipper doesn't pull. For joggers that match, check the waist and inseam separately.

Measure chest and height first

Chest measurement is the most reliable way to size a sweatshirt. Wrap a soft tape measure under the arms and across the fullest part of the chest. Add 2–4 inches for a relaxed fit. Height also matters because sweatshirt lengths vary by brand. Compare your child's height to the size chart's height range to avoid a crop that rides up or a hem that drags.

Snug vs. relaxed: which fit works best?

A snug fit works well for active play because it reduces bulk and keeps the sweatshirt close to the body. A relaxed fit is better for layering over tees or under jackets. Keep in mind that cotton sweatshirts can shrink slightly in the first wash, so a relaxed fit gives you a little margin. If you prefer a trim look after washing, start with a snug fit in the size that matches your child's chest measurement.

Zip-up hoodies vs. pullover crewnecks

Zip-up hoodies are easier to put on and take off, especially for younger kids who struggle with overhead styles. They also allow temperature control—unzip when warm, zip up when cool. Pullover crewnecks tend to have a cleaner silhouette and fewer zipper issues, but they can be trickier for toddlers. If you choose a zip-up, make sure the zipper is smooth and the hoodie isn't too tight across the chest when zipped.

Decision rules for choosing kids sweatshirt size

  • If your child is between sizes: Choose the larger size for a zip-up hoodie so the zipper doesn't pull across the chest. For a pullover crewneck, the smaller size may work if you prefer a snug fit. Size up for zip-ups, consider snug for pullovers.
  • If you plan to layer: Add 2–4 inches to the chest measurement and select the size that matches that number. A relaxed fit hoodie layers comfortably over a long-sleeve tee. Always size up for layering.
  • If you want the sweatshirt to last two seasons: Buy the larger size in a relaxed fit style. The extra room accommodates growth, and the relaxed cut still looks intentional rather than oversized. Relaxed fit + one size up = longer wear.

Products that make sizing easier

  • Kids Zip Up Hoodie - Blue Denim Check: Made with soft, durable fabric, this jacket is perfect for parents and kids on the go. And, with a matching design for the whole family, you can't go wrong! The durable fabric holds its shape wash after wash, so the size you choose stays consistent. The family matching option means you can size your child based on the same size chart you use for yourself.
  • Essentials Relaxed Fit Joggers - Black & White Mini Check: With a functioning drawstring and relaxed fit, these joggers are both stylish and comfortable. The drawstring waist lets you adjust the fit as your child grows, extending the wear time. Pair with a hoodie in the same size for a coordinated outfit without guesswork.

Which fit is right for your child?

Best for

  • Active kids who need freedom of movement and easy on/off
  • Parents who want a hoodie that works for both play and layering

Not for

  • Kids who prefer a slim, athletic silhouette without extra fabric
  • Toddlers who struggle with pullover styles (choose a zip-up instead)