Size chart
OshKosh B'gosh baby size chart
OshKosh B'gosh publishes 9 baby and toddler sizes, 3M to 4T, by weight and height. Checked against carters.com on October 4, 2026.
Size chart
- 3M9 to 12.5 lb
- 6M12.5 to 17 lb
- 9M17 to 21 lb
- 12M21 to 25 lb
- 18M25 to 28 lb
- 24M28 to 30 lb
- 2T29 to 31 lb
- 3T31 to 33 lb
- 4T33 to 37.5 lb
Weight in lb, exactly as OshKosh B'gosh publishes it.
Does OshKosh B'gosh run small or large?
True to sizeAcross 6 size labels that other brands also use, OshKosh B'gosh's published ranges sit close to the middle of the pack. The same label covers about the same baby.
Based on published size charts compared with other brands. This is not a fit review.
What a typical baby wears in OshKosh B'gosh
For a baby in the middle of the WHO growth chart, with room to grow. Your baby's own measurements give a closer answer in the calculator below.
| Age | Typical weight | Typical length | OshKosh B'gosh size |
|---|---|---|---|
| Birth | 7.3 lb | 19.5 in | under 3M |
| 3 months | 13.5 lb | 23.9 in | 6M |
| 6 months | 16.8 lb | 26.2 in | 6M |
| 9 months | 18.9 lb | 28 in | 9M |
| 12 months | 20.5 lb | 29.5 in | 12M |
| 18 months | 23.3 lb | 32.1 in | 24M |
| 2 years | 26.1 lb | 34 in | 2T |
| 3 years | 31.1 lb | 37.6 in | 3T |
The chart as published
The original wording from OshKosh B'gosh's chart, size by size.
| Size | Weight | Height or length | Age |
|---|---|---|---|
| 3M | 9 - 12.5lb | 21.5 - 24" | Not published |
| 6M | 12.5 - 17lb | 24 - 27" | Not published |
| 9M | 17 - 21lb | 27 - 28.5" | Not published |
| 12M | 21 - 25lb | 28.5 - 30" | Not published |
| 18M | 25 - 28lb | 30 - 32" | Not published |
| 24M | 28 - 30lb | 32 - 34" | Not published |
| 2T | 29 - 31 lb | 35 - 36.5" | Not published |
| 3T | 31 - 33 lb | 36.5 - 39" | Not published |
| 4T | 33 - 37.5 lb | 39 - 41.5" | Not published |
Notes on this chart. Partial chart: 3M through 4T, taken from the size charts shown on OshKosh B'gosh product pages. Sizes below 3M could not be confirmed and are not listed. The numbers match the Carter's chart. As published, 24M tops out at 34 in and 30 lb while 2T starts at 35 in and 29 lb.
Sources
- Brand's own site: https://www.carters.com/p/baby-girl-long-sleeve-bodysuit-red/V_1V930510
- Brand's own site: https://www.carters.com/p/toddler-boy-vintage-oshkosh-b-gosh-long-sleeve-graphic-tee-brown/V_2T725510
Retrieved October 4, 2026. Brands update their charts, so check the brand's page before a big purchase. This site is not affiliated with OshKosh B'gosh.
Calculator
What OshKosh B'gosh size on your date?
Start with a birth or due date
Sizes for each brand you pick will appear here, ready for the date you choose.