Yarn Weight Chart for Baby Projects (0–7, and What Each One Is Good For)
For most baby projects you want weight 3 (DK) or weight 4 (worsted). Weight 3 for anything worn — hats, booties, cardigans. Weight 4 for blankets. Everything else has a use, but those two cover the great majority of baby gifts.
Here is the whole system, and then the part that matters: which weight to pick for what.
The standard yarn weight chart
The numbers 0–7 come from the Craft Yarn Council’s Standard Yarn Weight System, which is the one thing in this hobby that genuinely is standardised. The symbol on a yarn label is a ball of yarn with the number inside it.
| # | Name | Also called | Hook size (metric) | Hook size (US) | Single crochet gauge, 4 in |
|---|---|---|---|---|---|
| 0 | Lace | Fingering 10-count, thread | 1.6–2.25 mm | Steel 6–8, B-1 | 32–42 sts |
| 1 | Super Fine | Sock, fingering, baby | 2.25–3.5 mm | B-1 to E-4 | 21–32 sts |
| 2 | Fine | Sport, baby | 3.5–4.5 mm | E-4 to 7 | 16–20 sts |
| 3 | Light | DK, light worsted | 4.5–5.5 mm | 7 to I-9 | 12–17 sts |
| 4 | Medium | Worsted, afghan, aran | 5.5–6.5 mm | I-9 to K-10½ | 11–14 sts |
| 5 | Bulky | Chunky, craft, rug | 6.5–9 mm | K-10½ to M-13 | 8–11 sts |
| 6 | Super Bulky | Super chunky, roving | 9–15 mm | M-13 to Q | 6–9 sts |
| 7 | Jumbo | Jumbo, roving | 15 mm and up | Q and larger | 5 sts and fewer |
Note that “baby” appears as an alternative name for both weight 1 and weight 2. This is a genuine trap and it causes more wrong-gauge projects than anything else on this page. A label that says “baby yarn” tells you the manufacturer’s marketing category, not the weight. Read the number, not the word.
Which weight for which baby project
| Project | Best weight | Why |
|---|---|---|
| Baby blanket | 4 (worsted) | Works up at a sane speed, drapes, widely available, cheap to replace |
| Lightweight summer blanket | 3 (DK) in cotton | Cooler, less bulk |
| Hats and booties | 3 (DK) | Fine enough to hold shape on a small head, quick to make |
| Cardigans and dresses | 2–3 (sport/DK) | Weight 4 makes baby clothes stiff and heavy |
| Amigurumi and soft toys | 3–4, small hook | You want a dense fabric with no gaps for stuffing to show through |
| Heirloom christening pieces | 0–1 (lace/super fine) | The traditional look; slow, and not machine-washable in most cases |
| Chunky “arm knit” style blankets | 6–7 | Fast and photogenic, but see the warning below |
Two warnings the charts don’t give you
Do not use weight 6 or 7 for anything a baby sleeps near. Super bulky and jumbo blankets have gaps between stitches large enough for a small hand or foot to go through, and they are heavy. They photograph beautifully. That is their whole appeal, and it is not a good reason.
Do not use weight 4 for baby clothes. It is the right answer for blankets and the wrong answer for cardigans. A worsted-weight baby cardigan comes out thick, stiff and about a third heavier than the child wants to wear.
Substituting one weight for another
You can, within one step, if you adjust. Going from weight 4 to weight 3 with the same instructions gives you a finished item roughly 10–15% smaller. Going the other way makes it that much bigger.
The way to substitute properly:
- Work a gauge swatch in the new yarn with the hook the label suggests.
- Compare your stitches-per-4-inches with the pattern’s.
- Too many stitches means your work is too tight — go up a hook size. Too few, go down.
- Re-swatch. It is dull and it is the only method that works.
What you cannot do is substitute across two steps. Weight 2 in place of weight 4 is not a hook adjustment, it is a different garment.
What most yarn weight charts get wrong
They present the gauge ranges as rules. They are the ranges the Craft Yarn Council found typical across the industry. Individual yarns sit outside them regularly, especially cotton and anything with a novelty texture. Your yarn’s own label beats this chart every time.
They list “baby” as a weight. It is not one. It is a marketing word that gets applied to weights 1, 2 and 3 depending on the brand.
They skip fibre entirely, which for baby items matters as much as weight. A weight-4 acrylic and a weight-4 alpaca behave nothing alike in a wash.
Frequently asked questions
What is the most common yarn weight? Weight 4, medium/worsted. It is the default for most patterns published in the US, and the easiest to find in any shop.
Is DK the same as light worsted? Close enough to substitute freely — both are weight 3. DK is a UK term, light worsted is the US one. DK is often a touch finer.
What weight is baby yarn? There is no single answer, and that is the problem. Check the number in the yarn-ball symbol on the label. Most yarn sold as “baby” is weight 2 or 3.
Can I hold two strands together to make a heavier yarn? Yes. Two strands of DK approximates a weight 5 bulky reasonably well. Two strands of worsted gets you to roughly weight 6. Swatch it — the result is usually slightly heavier and much stiffer than the equivalent single yarn.
Which weight is fastest for a baby blanket? Weight 5 bulky is a good balance of speed and safety. Weight 6 and 7 are faster still but produce gaps and weight you don’t want on a baby item.