Size chart
Old Navy baby size chart
Old Navy publishes 10 baby and toddler sizes, Up to 7 lb to 4T, by weight and height. Checked against oldnavy.gap.com on October 4, 2026.
Size chart
- Up to 7 lbup to 6.6 lb
- 0-3M6.6 to 13.2 lb
- 3-6M13.2 to 17.6 lb
- 6-9M17.6 to 19.8 lb
- 6-12M17.6 to 22 lb
- 12-18M22 to 24.3 lb
- 18-24M24.3 to 26.5 lb
- 2T26.5 to 28.7 lb
- 3T28.7 to 33.1 lb
- 4T33.1 to 35.3 lb
Weight in lb, exactly as Old Navy publishes it.
Does Old Navy run small or large?
True to sizeAcross 9 size labels that other brands also use, Old Navy'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 Old Navy
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 | Old Navy size |
|---|---|---|---|
| Birth | 7.3 lb | 19.5 in | 0-3M |
| 3 months | 13.5 lb | 23.9 in | 3-6M |
| 6 months | 16.8 lb | 26.2 in | 3-6M |
| 9 months | 18.9 lb | 28 in | 6-12M |
| 12 months | 20.5 lb | 29.5 in | 12-18M |
| 18 months | 23.3 lb | 32.1 in | 18-24M |
| 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 Old Navy's chart, size by size.
| Size | Weight | Height or length | Age |
|---|---|---|---|
| Up to 7 lbs | Up to 7 lbs / Up to 3 kg | Up to 21 ½ in / Up to 55 cm | Not published |
| 0-3 M | 7 - 14 lbs / 3 - 6 kg | 21 ½ - 24 in / 55 - 61 cm | Not published |
| 3-6 M | 14 - 17 lbs / 6 - 8 kg | 24 - 26 ½ in / 61 - 67 cm | Not published |
| 6-9 M | 17 - 19 lbs / 8 - 9 kg | 26 ½ - 29 in / 67 - 74 cm | Not published |
| 6-12 M | 17 - 21 lbs / 8 - 10 kg | 26 ½ - 29 in / 67 - 74 cm | Not published |
| 12-18 M | 21 - 24 lbs / 10 - 11 kg | 29 - 31 ½ in / 74 - 80 cm | Not published |
| 18-24 M | 24 - 26 lbs / 11 - 12 kg | 31 ½ - 33 ¾ in / 80 - 86 cm | Not published |
| 2T | 26 - 28 lbs / 12 - 13 kg | 33 ¾ - 36 in / 86 - 92 cm | Not published |
| 3T | 28 - 32 lbs / 13 - 15 kg | 36 - 39 in / 92 - 99 cm | Not published |
| 4T | 32 - 36 lbs / 15 - 16 kg | 39 - 42 in / 99 - 107 cm | Not published |
Notes on this chart. From the brand's baby size chart for tops, dresses, and bottoms. The brand publishes imperial and whole-number metric values; the metric values are used as published, so they are coarser than the imperial ones. 6-9 M and 6-12 M share the same length range.
Sources
- Brand's own site: https://oldnavy.gap.com/Asset_Archive/AllBrands/sizeChart/v3/division-chart.html?division=baby
- Brand's own site: https://oldnavy.gap.com/Asset_Archive/AllBrands/sizeChart/v3/data/on/current/babyTops.js
Retrieved October 4, 2026. Brands update their charts, so check the brand's page before a big purchase. This site is not affiliated with Old Navy.
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