Standard CYC baby measurements (0–18 months): sizes and ease for knitting
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Check the standard baby body measurements according to the Craft Yarn Council (CYC). We include charts in centimeters for the 0–3 m, 3–6 m, 6–12 m, and 12–18 m ranges, along with recommendations for ease and practical tips to make your garments comfortable and able to accommodate growth.
Table of contents
How to use these charts
CYC charts show body measurements (not finished-garment measurements). To calculate the pattern's final circumference, you must add the appropriate ease. For babies, it's essential to prioritize comfort, ease of dressing, and room for growth.
CYC baby size chart (0–18 months)
Typical body measurements in cm for baby garments. The values are typical ranges used in the CYC standard.
| Age | Chest (cm) | Waist (cm) | Hips (cm) | Center back neck-to-wrist (cm) | Back waist length (cm) | Armhole depth (cm) | Head circumference (cm) |
|---|---|---|---|---|---|---|---|
| 0–3 months | 43 | 43 | 43 | 27 | 14 | 9 | 36–40 |
| 3–6 months | 45.5 | 45.5 | 46 | 29 | 16 | 10 | 40–43 |
| 6–12 months | 48 | 48 | 48.5 | 32 | 17.5 | 11 | 44–46 |
| 12–18 months | 50.5 | 50.5 | 51 | 34 | 19 | 12 | 47–49 |
Reference source: Craft Yarn Council (CYC) — Baby Size Chart (cm). Remember to add ease to the finished garment.
Recommended ease for babies
Baby garments need generous ease to be comfortable and easy to put on and take off:
| Garment type | Ease over chest/head | Notes |
|---|---|---|
| Lightweight sweater/cardigan | 4–8 cm | For everyday use; prioritize a wide neckline or opening. |
| Sweatshirt/knitted coat | 8–12 cm | Allows room for inner layers without squeezing. |
| Baby rompers/bodysuits | 4–8 cm | Consider the diaper; add ease at the hip/crotch. |
| Hats | −1 to 0 cm | Slight negative ease to keep it from falling off; adjust according to stretch. |
Ease is added to the body measurement (except hats, which usually have a slight negative ease).
Fit and growth tips
- Easy openings: use buttons/snaps at the shoulder or front for effortless dressing.
- Sleeves and lengths: leave foldable cuffs and extra length to accommodate growth.
- Soft fibers: prioritize skin-friendly materials (soft merino, combed cotton) and flat seams.
- Blocking and washing: pre-wash the yarn cake if it is likely to shrink; always follow the care label.
Frequently asked questions
Should I choose based on age or actual measurements?
Age is a guideline. Prioritize the chest circumference and adjust lengths according to the baby. If in doubt, go up a size.
How much ease should I add for outerwear?
Between 8–12 cm over the chest. Adjust according to the fabric weight and the layers worn underneath.
How much ease should baby hats have?
A slight negative ease (−1 to 0 cm) is normally used to keep them in place; this depends on the stretch of the stitch.
Related articles
- Complete guide: Standard measurements by size (CYC): women, men, children, and babies
- CYC standard measurements for women
- CYC standard measurements for men
- CYC standard measurements for children
- How much yarn do I need for my size?
- View all yarn cakes at Idealium →
Main source: Craft Yarn Council (CYC) — Standard Body Measurements (Baby). Approximate values.
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