Sizing Baby Knits Realistically
Babies grow at staggering rates in the first year. A "newborn" hat fits for two weeks; a "3-month" sweater fits for a month. Sizing baby knits realistically — typically up — saves the heartbreak of finishing a garment that the baby has already outgrown.
Recommended A printable technique cheat-sheet for your knitting bag.
Standard size growth chart
Newborn: 0–1 month (often skipped — too short a window). 0–3 months: 7–12 lbs. 3–6 months: 12–17 lbs. 6–12 months: 17–22 lbs. 12–18 months: 22–28 lbs.
Knit one size larger
Most baby knits are best made one size larger than the baby's current size. A 6-month sweater fits a 3-month baby loosely (and lasts months); a 3-month sweater fits a 3-month baby for two weeks.
In partnership Tools and supplies that make this technique easier.
Plan for seasons
A heavy wool sweater knit for a December baby fits in March, when the weather is warming and the sweater is no longer needed. Knit ahead by 3–6 months and consider what season the garment will fit.
Adjustable features
Garter-stitch borders that fold up and down. Long ribbing that rolls and unrolls. Drawstring waists. Adjustable garments fit longer than fixed ones.
Abbreviation reference
| Abbreviation | Meaning |
|---|---|
| CO | cast on |
| BO | bind off |
Tips
- Always knit one size larger than the baby's current size.
- Plan ahead by 3–6 months for seasonal appropriateness.
- Add adjustable features (folded cuffs, drawstrings) to extend the fit window.
In depth
Sizing baby knits is the single most underestimated aspect of baby knitting. The mismatch between human gestation (9 months) and knitting time (weeks to months) means that babies often grow out of garments before they are finished. Sizing up and planning ahead are the two best defences against this.