Sizing tool
Youth Shirt Size Chart
Use chest and height to narrow a youth shirt size.
| Label | Age guide | Height | Chest | Waist |
|---|---|---|---|---|
| NB | 1–2 months | 22 in / 56 cm | 15–17 in / 38–43 cm | 15.5–17 in / 39–43 cm |
| 3M | 2–4 months | 24 in / 62 cm | 17–17.75 in / 43–45 cm | 17–17.75 in / 43–45 cm |
| 6M | 4–6 months | 27 in / 68 cm | 17.75–18.5 in / 45–47 cm | 17.75–18.5 in / 45–47 cm |
| 9M | 6–9 months | 29 in / 74 cm | 18.5–19.25 in / 47–49 cm | 18.5–19.25 in / 47–49 cm |
| 12M | 9–12 months | 31 in / 80 cm | 19.25–20 in / 49–51 cm | 19.25–19.75 in / 49–50 cm |
| 18M | 12–18 months | 34 in / 86 cm | 20–20.5 in / 51–52 cm | 19.75–20 in / 50–51 cm |
| 2T | 1.5–2 years | 36 in / 92 cm | 20.5–21.25 in / 52–54 cm | 19.5–20.5 in / 50–52 cm |
| 3T | 2–3 years | 39 in / 98 cm | 21.25–22 in / 54–56 cm | 20.5–21.25 in / 52–54 cm |
| 4T | 3–4 years | 41 in / 104 cm | 22–22.75 in / 56–58 cm | 21.25–21.5 in / 54–55 cm |
| 5T | 4–5 years | 43 in / 110 cm | 22.75–23.5 in / 58–60 cm | 21.5–22 in / 55–56 cm |
| 6 | 5–6 years | 46 in / 116 cm | 23.5–24.75 in / 60–63 cm | 22–22.5 in / 56–57 cm |
| 7–8 | 7–9 years | 50–53 in / 128–134 cm | 25–28 in / 64–71 cm | 22.75–24.75 in / 58–63 cm |
| 10–12 | 9–11 years | 55–57 in / 140–146 cm | 27.5–30.75 in / 70–78 cm | 24.5–26.75 in / 62–68 cm |
| 14–16 | 11–13 years | 60–62 in / 152–158 cm | 30.25–33.75 in / 77–86 cm | 25.5–28.75 in / 65–73 cm |
Youth shirts: use chest and height before age
Chest and height give a more specific starting point than age alone; then check whether the shirt is athletic, uniform, casual or layered.
Use the manufacturer chart as the final reference because children’s proportions and brand grading vary.
Method & references
How this guidance is checked
These sources support the measurement method and help check real-world variation. They are not presented as one universal brand-size table.
- ISO 8559-2:2025 — Size designation of clothes — Primary and secondary dimension indicators — International Organization for Standardization (ISO). Clothing methodology: size designation should be based on defined body measurements rather than assuming universal retail labels.
- Kids Size Guide — H&M. Cross-check for kids’ height, chest and waist ranges from baby through youth sizes.
- Kids Clothing Size Chart — Carter's. Second-brand cross-check showing age labels are approximate and height/weight or other measurements should lead kids sizing.
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