Find your child's OshKosh B'gosh size
Enter your child's measurements and we'll show the right size — plus how long it will last.
Size recommendations are based on official brand size charts and are provided as a guide only. Fit may vary by item, style, and individual child. Outgrow is not responsible for sizing decisions made based on these recommendations.
Does OshKosh Run Small, Large, or True to Size?
OshKosh runs true to size for most items, but slightly slimmer than Carter's — particularly in denim, jeans, and their signature overalls. Since Carter's is the US sizing reference for most parents, this is the most important comparison to understand.
Key things to know:
- Basics and casual tops: True to size. OshKosh tops and t-shirts fit very similarly to Carter's at the same size label.
- Denim and jeans: Run slimmer through the waist and leg than Carter's equivalent. If your child is between sizes, size up in OshKosh denim.
- Overalls and dungarees: OshKosh's signature item and worth treating separately. The bib overalls run slim in the body and are cut for an active, unpadded fit — not designed for bulky diapers. For younger toddlers still in nappies, size up one for comfort.
- Sleepwear: Like Carter's, OshKosh pyjamas run snug. Size up one from your child's regular OshKosh size for a comfortable fit.
- Overall vs Carter's: OshKosh is a half-step slimmer than Carter's on average. Most parents who shop both brands can use the same size label, but for denim and structured items, leaning toward the next size up at OshKosh is sensible.
OshKosh Baby Size Chart (Newborn–24 Months)
Measurements from the official Carter's/OshKosh size chart.
| OshKosh Size | Height | Height (cm) | Weight |
|---|---|---|---|
| Preemie | Up to 18" | Up to 46 cm | Up to 6 lbs / 2.7 kg |
| Newborn (NB) | 18–21.5" | 46–55 cm | 6–9 lbs / 2.7–4 kg |
| 3 Months | 21.5–24" | 55–61 cm | 9–12.5 lbs / 4–5.7 kg |
| 6 Months | 24–27" | 61–69 cm | 12.5–17 lbs / 5.7–7.7 kg |
| 9 Months | 27–28.5" | 69–72 cm | 17–21 lbs / 7.7–9.5 kg |
| 12 Months | 28.5–30" | 72–76 cm | 21–25 lbs / 9.5–11.3 kg |
| 18 Months | 30–32" | 76–81 cm | 25–28 lbs / 11.3–12.7 kg |
| 24 Months | 32–34" | 81–86 cm | 28–30 lbs / 12.7–13.6 kg |
OshKosh Toddler Size Chart (2T–5T)
| OshKosh Size | Age Guide | Height | Height (cm) | Weight |
|---|---|---|---|---|
| 2T | 2 years | 35–36.5" | 89–93 cm | 29–31 lbs / 13–14 kg |
| 3T | 3 years | 36.5–39" | 93–99 cm | 31–33 lbs / 14–15 kg |
| 4T | 4 years | 39–41.5" | 99–105 cm | 34–37.5 lbs / 15.4–17 kg |
| 5T | 5 years | 41.5–44" | 105–112 cm | 37.5–42 lbs / 17–19 kg |
OshKosh Kids Size Chart (4–14)
| OshKosh Size | Age Guide | Height | Height (cm) | Weight |
|---|---|---|---|---|
| 4 | 4–5 years | 40–42.5" | 102–108 cm | 34–38.5 lbs / 15.4–17.5 kg |
| 5 | 5–6 years | 42.5–45" | 108–114 cm | 38.5–43 lbs / 17.5–19.5 kg |
| 6/6X | 6–7 years | 45–47.5" | 114–121 cm | 43–48 lbs / 19.5–21.8 kg |
| 7 | 7–8 years | 48–51.5" | 122–131 cm | 50–59.5 lbs / 22.7–27 kg |
| 8 | 8–9 years | 50.5–53.5" | 128–136 cm | 59.5–69.5 lbs / 27–31.5 kg |
| 10 | 9–11 years | 54–56" | 137–142 cm | 69.5–87 lbs / 31.5–39.5 kg |
| 12 | 11–13 years | 56–60" | 142–152 cm | 87–101 lbs / 39.5–45.8 kg |
| 14 | 12–14 years | 59–62.5" | 150–159 cm | 93–113 lbs / 42–51.3 kg |
OshKosh Overalls Sizing — What You Need to Know
Overalls are what OshKosh is famous for, and they deserve their own section because they fit differently from standard tops and bottoms.
OshKosh overalls are cut slim and structured — they're designed for an active fit, not a roomy one. This is intentional and part of the brand's heritage look, but it means a few practical considerations for parents:
- Nappy/diaper stage: Size up one for toddlers still in nappies. The bib overalls don't have the extra room in the seat that Carter's bottoms include, so your standard size will feel tight.
- Layering in winter: If your child will wear the overalls over a thick fleece or hoodie, consider sizing up one for the colder months.
- The bib adjustment: OshKosh overalls have adjustable shoulder straps and a button closure at the sides — this gives you more range than a fixed-waist trouser, so fit is more forgiving than you might expect once you learn the adjustment system.
- Denim vs jersey overalls: OshKosh makes overalls in both denim and softer jersey fabrics. The denim versions run slimmer and have less stretch. The jersey versions are more forgiving and fit closer to the standard size chart.
OshKosh vs Carter's — The Key Differences
Since OshKosh is a Carter's subsidiary, parents often treat the two as interchangeable. They're close, but not identical.
| OshKosh | Carter's | |
|---|---|---|
| Size chart | Same height/weight numbers | Same height/weight numbers |
| Actual fit | Slightly slimmer, especially in denim | More generous, particularly in bottoms |
| Overalls/denim | Signature category, slim cut | Less focus on denim |
| Basics/jersey | Very similar to Carter's | Very similar to OshKosh |
| Sleepwear | Snug — size up one | Snug — size up one |
| Diaper room | Less allowance in bottoms | More allowance built in |
| Size range | Up to size 14 | Up to size 14 |
| Style | More denim-focused, heritage aesthetic | Broader basics range |
| Price | Very similar, frequent joint sales | Very similar, frequent joint sales |
The practical summary: if your child wears Carter's 4T, OshKosh 4T will fit in jersey basics. For denim and overalls, consider 5T if they're at the top of the 4T range.
How OshKosh Compares to Other Brands
| Brand | vs. OshKosh |
|---|---|
| Carter's | Nearly identical size chart; OshKosh runs slightly slimmer in structured items |
| Gap Kids | Gap runs larger — typically one size up from OshKosh |
| Old Navy | Old Navy runs slightly larger, similar to Gap |
| The Children's Place | TCP runs slimmer than OshKosh overall |
| Nike Kids | Athletic cut; runs similar to OshKosh in basics, roomier in sportswear |
| H&M | H&M and OshKosh are surprisingly similar in how they fit — both slim, both cut narrower than US brands. An OshKosh 3T is roughly H&M 98 (2–3Y) |
How Long Will OshKosh Clothes Last?
| OshKosh Size | Average Wear Time |
|---|---|
| Newborn | 4–8 weeks |
| 3M | 6–10 weeks |
| 6M | 2–3 months |
| 9M–12M | 3–4 months |
| 18M–24M | 4–6 months |
| 2T–3T | 5–8 months |
| 4T–5T | 7–10 months |
| 4–6 | 8–12 months |
| 7–10 | 10–14 months |
| 12–14 | 12–16 months |
Frequently Asked Questions
Does OshKosh run the same as Carter's?
Very close but not identical. The size chart numbers are the same since both brands are owned by Carter’s Inc., but OshKosh runs slightly slimmer in practice — particularly in denim and overalls. For jersey basics, the two brands fit almost interchangeably. For structured items and denim, lean toward sizing up at OshKosh if your child is between sizes.
Do OshKosh overalls run small?
Yes, slightly. OshKosh overalls are cut slim and structured, and don’t have the diaper-room allowance built into Carter’s bottoms. If your toddler is still in nappies, size up one. The adjustable straps and side buttons do give you more flexibility than a standard waistband.
Do OshKosh pyjamas run small?
Yes — like Carter’s, OshKosh sleepwear runs snug. Size up one from your child’s regular OshKosh size for a comfortable pyjama fit.
What is the difference between Carter's and OshKosh?
OshKosh and Carter’s are both owned by Carter’s Inc. and sold in the same stores. Carter’s focuses on soft basics, bodysuits, and sleepwear for babies and toddlers. OshKosh is more denim-focused with a heritage workwear aesthetic — their overalls are their iconic product. The size charts are the same, but OshKosh fits slightly slimmer in structured items.
What sizes does OshKosh go up to?
OshKosh goes up to size 14 in kids’ clothing, equivalent to Carter’s upper range. For bigger kids, The Children’s Place goes up to size 18 and is worth considering alongside OshKosh.
Is OshKosh a good brand for school uniforms?
OshKosh doesn’t have a dedicated school uniform range the way The Children’s Place or Old Navy does. For uniforms, TCP or Old Navy are better options. OshKosh’s strength is casual playwear and denim.
Also shopping at Carter's, Gap Kids, Old Navy, The Children's Place, H&M, Nike Kids or Zara?