What Size Is After 4T? | Why 5T Isn’t the Only Answer

The next size after 4T is typically 5T, but some parents find that regular size 4 fits better as an intermediate step before 5T.

You probably thought the hard sizing puzzle ended once you figured out the difference between 24 months and 2T. But just when your child settles into 4T, they start to outgrow it, and the obvious answer seems to be reaching for 5T.

The reality is a little less automatic. While 5T is the standard next toddler size, regular size 4 (without the T) works well for some children, especially those who are potty trained or have leaner builds. Knowing what to look for can help you avoid baggy clothes or unnecessary returns.

How 4T and 5T Actually Compare

Parents.com’s size chart puts 4T at 39 to 41.5 inches tall and 34 to 37.5 pounds. 5T shifts up slightly to 41.5 to 44 inches and 37.5 to 45 pounds. The difference is only a couple of inches and a few pounds, so overlap is common.

The “T” signals a toddler cut. Pants are roomier through the seat and hips to allow space for a diaper or training pants. Once a child is fully potty trained, that extra room can look saggy or bunch up oddly around the waistband.

That’s where regular size 4 enters the picture. It targets roughly the same height range as 4T but with a straighter, slimmer shape designed for children who no longer need diaper bulk.

Why The “T” Size Confusion Happens

Parenting forums are full of people asking whether 4 and 4T are the same thing or whether they should buy 5 or 5T. The confusion isn’t random — it usually comes down to a few predictable reasons.

• Diaper room versus potty training: Sizes with a T (4T, 5T) are cut with extra fabric in the rear and hips. Regular sizes assume a potty-trained body and fit more closely through the seat. The same child can need different numbers depending on which cut they’re wearing.
• Brand sizing drift: A 4T at Carter’s may run long and full, while Gymboree’s 4T fits a hair shorter. It’s not unusual for a child to wear 4T from one brand and 5T from another at the same time.
• The phantom intermediate size: Regular size 4 is technically intended for children around age five, but its measurements often land right between 4T and 5T. It isn’t always displayed prominently on store racks next to the toddler section.
• Height and weight overlap: The top end of 4T (41.5 inches, 37.5 lbs) nearly matches the bottom end of 5T (41.5 inches, 37.5 lbs). A child at the crossover point could honestly wear either size depending on the brand.

Knowing these patterns helps you shop by shape, not just by the number on the tag. You start looking for the right cut for your child’s current body, not just a bigger version of the same thing.

How to Pick Between 4T, Size 4, and 5T

The easiest test is to look at how their current 4T fits. If the waistband leaves a red line after meals or you’re constantly pulling the shirt down to cover their belly, it’s time to go up.

If your child is potty trained and the 4T bunches around the seat, try a regular size 4 first. It removes the diaper bulk without adding extra length. If they’re still in diapers or training pants, stick with the T series — that extra seat room is there for a reason.

The letter isn’t a secret code: T stands for toddler and signals diaper-friendly proportions. Once you move to regular kids’ sizing, the cut shifts to a leaner silhouette.

The numbers overlap considerably. A lean potty-trained child may size up to regular 4 before 5T, while a child still in diapers will stay comfortable in the T line a little longer.

3 Signs Your Child Is Ready for the Next Size

Beyond comparing charts, your child’s daily comfort tells you when it’s time. Watch for these three clues.

1. The belly gap: If shirts ride up every time they raise their arms or pants sit below the natural waist, the proportions are off.
2. The snap struggle: Onsies, sleepers, and bodysuits that are difficult to fasten or leave red marks are too small, even if the length seems okay.
3. The high water return: If pants that used to hit the ankle now hover above the sock line, you’ve lost length even if the waist still fits.

Each of these signs means your child has outgrown the current size. Whether you grab 5T or regular size 4, the goal is a fit that lets them move and play without being restricted.

What About Sizes Beyond 5T?

Once your child moves past 5T, kids’ clothing drops the T entirely. You’ll see size 5, 6, 6X, and so on. The jump from 5T to regular size 5 follows the same pattern as 4T to 4 — the T version is wider through the seat, and the standard version is slimmer.

One parenting blog frames size 4 as intermediate between toddler and standard kids’ cuts. The same logic holds through the whole transition: watch the child’s proportions and diaper status, not just the label.

This progression continues up through big kid sizes (often starting around size 8 or S/M/L). The T-to-regular transition is the last time you’ll think about diaper room, which simplifies shopping as your child gets older.

The Bottom Line

The size after 4T is usually 5T, but regular size 4 is worth a try if your child is potty trained or has a lean build. Fitting well means focusing on the seat and waist, not just the tag number. Always check the brand’s specific size chart before ordering.

If you’re stuck between two sizes, a quick trip to a store with a generous return policy or a sizing kit from a mail-order service can make the choice risk-free and frustration-free.