Reference chart
Crochet baby size chart for garments
Crochet baby garment sizes use chest circumference and body lengths. A 3 month baby chest measures about 16 inches, 6 months 17 inches, 12 months 18 inches, 18 months 19 inches and 24 months 20 inches. Add 1–4 inches of positive ease to the chest measurement for sweaters and cardigans.
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| Age | Chest (in) | Center back neck to cuff (in) | Back waist length (in) | Cross back (in) | Sleeve length to underarm (in) |
|---|---|---|---|---|---|
| 3 months | 16 | 10.5 | 6 | 7.25 | 6 |
| 6 months | 17 | 11.5 | 7 | 7.75 | 6.5 |
| 12 months | 18 | 12.5 | 7.5 | 8.25 | 7.5 |
| 18 months | 19 | 14 | 8 | 8.5 | 8 |
| 24 months | 20 | 18 | 8.5 | 8.75 | 8.5 |
How much ease should a crochet baby sweater have?
A crochet baby sweater should have about 2–4 inches of positive ease at the chest so the garment slips on easily over a diaper and clothing.
Close-fitting vests can use 1–2 inches of ease; outerwear and cardigans often use 3–4 inches.
Should you crochet baby clothes a size up?
Crocheting baby clothes one size up is a practical choice because babies grow quickly and handmade gifts are often worn weeks or months after they arrive.
What yarn is best for crochet baby clothes?
The best yarn for crochet baby clothes is a soft, machine-washable fine or light weight yarn, such as superwash merino, cotton blends or baby acrylic.
Avoid fuzzy yarns that shed and embellishments that could detach.
Source and method: Body measurements follow the Craft Yarn Council standard body measurement conventions for babies. These are body measurements, not finished garment sizes; add ease according to the intended fit.
Frequently asked questions
What is the chest size of a 6 month baby?
A 6 month baby has a chest circumference of about 17 inches (43 cm).
Are these measurements finished sizes?
No. The chart lists body measurements. Add ease to the chest measurement to get the finished garment size.
How long should baby sleeves be?
Sleeves to the underarm are about 6 inches at 3 months and about 8.5 inches at 24 months.