On their published size charts, baby-clothing brands do not line up: for the same label, some brands' charts cover heavier babies (so the label "runs big" on paper) and others cover lighter babies (it "runs small"). We compared the published charts of 22 brands and ranked them. The gap between the biggest and smallest is about 3 lb at the same label — which is why the size that fits in one brand can be wrong in another.
- Across 22 brands' published charts, the same label's upper weight limit swings about 3 lb between the brands that run biggest and smallest on paper.
- Runs biggest on paper: Patagonia (about +1.5 lb above the label median). Runs smallest: Old Navy (about −1.5 lb).
- This compares brand-published charts, not physical garment measurements.
- "Runs big" here means the label, not the garment. It reflects what weight a brand's chart assigns to a size — useful for picking a size before you buy.
- Buy by weight and height, not the age on the tag. The label is just a brand's average; your baby's measurements are the real guide.
- If your baby is between sizes, lean to the larger one for daytime clothes — you get more wear before the next jump.
- Always check the specific brand's own chart before buying; that is the only number that describes that brand's cut.
Which baby clothes brands run big?
These brands' published charts assign a heavier weight to the same label than the group median — so on paper the label covers a bigger baby and tends to last a little longer. The figure is the average pounds above the median across the labels we compared.
| Brand | Runs bigger by | Labels compared |
|---|---|---|
| Patagonia (baby) | +1.5 lb | 10 |
| The Children's Place | +1.2 lb | 11 |
| Gap (babyGap) | +0.9 lb | 10 |
| Amazon Essentials (baby) | +0.7 lb | 8 |
| Mini Boden | +0.7 lb | 6 |
| Hatley | +0.6 lb | 12 |
| Gerber Childrenswear | +0.4 lb | 11 |
| Burt's Bees Baby | +0.3 lb | 12 |
| Carter's | +0.2 lb | 13 |
| Quincy Mae | +0.2 lb | 7 |
| L.L.Bean (baby) | +0.2 lb | 4 |
| Hudson Baby | +0.1 lb | 11 |
"Runs bigger by" = average pounds the brand's published upper limits sit above the label median across the sizes compared.
Which baby clothes brands run small?
These brands' published charts assign a lighter weight to the same label — so on paper the size is outgrown a little sooner, and a between-sizes baby is more likely to need the next size up.
| Brand | Runs smaller by | Labels compared |
|---|---|---|
| Old Navy | −1.5 lb | 11 |
| Nike (infant/toddler) | −1.1 lb | 10 |
| Target Cat & Jack | −1.0 lb | 12 |
| Primary | −0.7 lb | 7 |
| Target Cloud Island | −0.6 lb | 8 |
| Walmart Garanimals | −0.6 lb | 11 |
| Hanna Andersson | −0.6 lb | 7 |
| Monica + Andy | −0.1 lb | 8 |
| Janie and Jack | −0.1 lb | 8 |
| Tea Collection | −0.1 lb | 10 |
What "runs big" or "runs small" really means here
The honest answer is that this ranking is about the label, not the fabric. We did not measure garments; we compared what weight each brand's published size chart assigns to each label, then measured how far that sits above or below the median across all the brands. A brand near the top gives its labels a heavier weight range on paper, so the same "6-9M" reaches a bigger baby; a brand near the bottom does the opposite.
Two brands can still sew a slightly different cut than their own chart implies, and fabrics stretch and shrink differently — so treat this as a shopping shortcut for picking a size, not a guarantee about a specific garment. For the underlying label-by-label spreads, see our Baby Clothing Size Index.
How to use this when you shop
Turn the ranking into three quick habits:
- Start from measurements. Weigh and measure your baby, then match those numbers to the baby size chart — the age on the tag is only an average.
- Adjust for the brand. Buying from a brand near the "runs small" list and your baby is between sizes? Take the larger size. Near the "runs big" list? The labeled size will usually last longer.
- Confirm on the brand's own chart. Each listing shows its own weight and height ranges; that number describes that brand's cut better than any general rule.
Download the data and cite this study
The full ranking of all 22 brands is free to download and cite: Download the Babbez Brand Fit Index 2026 dataset (CSV).
Cite this: Babbez Editorial Team. Which Baby Clothes Brands Run Big or Small: 22 Brands Compared. Babbez, 2026. https://babbez.com/blogs/baby-clothes/which-baby-clothes-brands-run-big-or-small
- Know your baby's weight and height first.
- Match them to the brand's own chart, not the age label.
- Brand runs small? Size up if in between. Runs big? Expect longer wear.
- Between two brands at the same label, expect up to a 3 lb difference.
Browse our best-selling baby and kids' clothes, each listed with its own weight and height range so the size is right the first time.
Shop best sellersFrequently asked questions
Does Carter's run big or small?
On its published size chart, Carter's sits just above the group median, about 0.2 lb, so its labels run very slightly big on paper but are close to average. In our comparison of 22 brands, the biggest "runs big" brands were Patagonia and The Children's Place, and the smallest were Old Navy and Nike. Always confirm against Carter's own current chart, since the safest number is the brand's own weight and height range.
Which baby clothes brands run small?
Based on their published charts, the brands that assign the lightest weights to each label, so they run smallest on paper, are Old Navy, Nike, and Target Cat and Jack, followed by Primary, Target Cloud Island, Walmart Garanimals, and Hanna Andersson. If you buy from these and your baby is between sizes, taking the larger size usually gives more wear.
Do all baby clothes brands use the same sizes?
No. The same label covers different weight ranges from brand to brand. Across 22 brands' published charts, the upper weight limit for the same label swings about 3 lb between the brands that run biggest and smallest, which is why a size that fits perfectly in one brand can be too big or too small in another. Buying by measured weight and height, not by the age on the tag, avoids most of the guesswork.
Should I size up in baby clothes?
For everyday daytime clothes, sizing up is a reasonable choice when your baby is between sizes or when you are buying from a brand that runs small, because you get more wear before the next jump. Match your baby's weight and height to the brand's own chart first, then decide. Fit needs differ by garment type, so always follow the specific brand's chart and care label.
Does the ranking describe the garment or the size label?
In this guide it is about the size label. We compared what weight each brand's published chart assigns to each label, not the physical measurements of the garments. A brand that "runs big" here gives its labels a heavier weight range on paper, so the same label reaches a bigger baby. Fabric, cut, and shrinkage can still vary, so treat the ranking as a shortcut for picking a size rather than a guarantee about one item.
Sources and method: Compiled from 22 brands' own published size charts (Carter's, Gap, Old Navy, Target Cat and Jack, Target Cloud Island, Walmart Garanimals, The Children's Place, Gerber, Burt's Bees Baby, Hanna Andersson, Patagonia, Mini Boden, Hatley, L.L.Bean, Amazon Essentials, Hudson Baby, Nike, Primary, Quincy Mae, Monica + Andy, Janie and Jack, Tea Collection). "Runs big/small" reflects each brand's published weight ranges versus the group median, not physical garment measurements. This is a shopping guide, not medical or safety advice; for sizing on sleepwear and any safety-related fit, follow the manufacturer and the garment care label, and see our medical disclaimer. Full data: our Baby Clothing Size Index and Size-Chart Transparency Index.
