Cribworthy Baby Size Finder
Baby clothes size chart and infant shoe size finder
Newborn size is not the same weight at Gerber as at Carter's, and a size 3 shoe is a different length at every brand. Enter your baby's weight and length, or a foot length, and see the size in each brand's own chart.
Quick answer
Baby clothes go by weight and length, not age. Newborn size is 6–9 lb in Carter's and Burt's Bees Baby; 5–8 lb in Gerber; Primary's chart starts at 0-3 months. 0-3 months is 9–12.5 lb in Carter's and Burt's Bees Baby; 8–12 lb in Gerber; 9–12 lb in Primary. Shoes go by foot length: a 4.5 inch foot is a size 4 in Stride Rite, size 4.5 in See Kai Run, size 4C in Nike and size 5 in Carter's. Every range here is from the brand's own chart, checked 2026-10-26.
12 lb (5.4 kg) and 23 in (58 cm): 3M at Carter's, 3-6M at Gerber, 0-3M at Burt's Bees Baby, 3-6M at Primary.
Your clothing size in each brand
From each brand's own chart. Full charts are below.
Carter's · Bodysuits and one-pieces
3M
By weight: 3M (9–12.5 lb)
By length: 3M (21.5–24 in)
Gerber · Clothing
3-6M
Weight and length disagree: the bigger size is shown
By weight: 3-6M (12–16 lb) · on the line with 0-3M · also 0-6M
By length: 0-3M (21–24 in) · also 0-6M
Burt's Bees Baby · Baby clothes
0-3M
By weight: 0-3M (9–12.5 lb)
By length: 0-3M (21.5–24 in)
Primary · Baby clothing
3-6M
By weight: 3-6M (12–15 lb) · on the line with 0-3M
By length: 3-6M (23–25 in) · on the line with 0-3M
Sleepwear with its own chart
Gerber · Cotton pajamas (snug fit)
6M
By weight: 6M (12–16 lb)
By length: chart starts at 24 in (6M)
Measure both feet standing, heel against a wall, and use the longer one (Stride Rite and Nike both say this).
A 4.5 in (11.4 cm) foot: 4 at Stride Rite, 4.5 at See Kai Run, 4C at Nike, 3 at Carter's Baby shoes, 4 at Carter's Every Step and First Walkers, 5 at Carter's Toddler and kids shoes, 4 at Gerber, 2 at Robeez Soft Soles, 4 at Robeez First Kicks.
Your shoe size in each brand
The smallest size whose listed length is at least the foot: “between sizes, go up”.
Stride Rite · Baby, toddler and little kid
Size 4
Listed at 11.6 cm · 9-12 months
About 0.2 cm longer than the foot (our subtraction)
Size 3.5 is listed at 11.2 cm, shorter than this foot
See Kai Run · First walker, toddler and preschool
Size 4.5
Listed at 11.7cm / 4 5/8"
About 0.3 cm longer than the foot (our subtraction)
Size 4 is listed at 11.3 cm, shorter than this foot
Nike · Babies and toddlers (C sizes)
Size 4C
Listed at 4 9/16 · 12 months
About 0.06 in longer than the foot (our subtraction)
Size 3C is listed at 4.25 in, shorter than this foot
Carter's · Baby shoes
Size 3
Listed at 4.5" · 6-9 months
Matches the listed length
Carter's · Every Step and First Walkers
Size 4
Listed at 4.5" · 9-24 months
Matches the listed length
Carter's · Toddler and kids shoes
Size 5
Listed at 4.75"
About 0.25 in longer than the foot (our subtraction)
Size 4 is listed at 4.25 in, shorter than this foot
Gerber · Baby shoes
Size 4
Listed at 4.5" · 9-12M
Matches the listed length
Robeez · Soft Soles
Size 2
Listed at up to 4 7/8" / 11.4 cm · 6-12 months
About 0.38 in longer than the foot (our subtraction)
Size 1 is listed at 4 in, shorter than this foot
Robeez · First Kicks
Size 4
Listed at up to 4 1/2" / 11.4 cm · 9-12 months
Matches the listed length
Baby clothes size chart by brand
Weight and length exactly as each brand states them, preemie to 24 months. Kilograms and centimetres are converted by us. Checked 2026-10-26.
Carter's · Bodysuits and one-pieces
| Size | Weight | Length |
|---|---|---|
| Up to 5 lb | up to 5 lbup to 2.3 kg | up to 17 inup to 43 cm |
| Preemie | up to 6 lbup to 2.7 kg | up to 18 inup to 46 cm |
| NB | 6–9 lb2.7–4.1 kg | 18–21.5 in46–55 cm |
| 3M | 9–12.5 lb4.1–5.7 kg | 21.5–24 in55–61 cm |
| 6M | 12.5–17 lb5.7–7.7 kg | 24–27 in61–69 cm |
| 9M | 17–21 lb7.7–9.5 kg | 27–28.5 in69–72 cm |
| 12M | 21–25 lb9.5–11.3 kg | 28.5–30 in72–76 cm |
| 18M | 25–28 lb11.3–12.7 kg | 30–32 in76–81 cm |
| 24M | 28–30 lb12.7–13.6 kg | 32–34 in81–86 cm |
Carter's pajama chart uses the same ranges through 24M. carters.com refuses automated requests, so the chart was read from the Internet Archive copy dated next to the link. Carter's labels name one age (3M, 6M); its costume chart calls the same ranges 3-6M and 6-9M, which is how the finder reads them.
Gerber · Clothing
| Size | Weight | Length |
|---|---|---|
| Preemie | up to 5 lbup to 2.3 kg | up to 17 inup to 43 cm |
| NB | 5–8 lb2.3–3.6 kg | 17–21 in43–53 cm |
| 0-3M | 8–12 lb3.6–5.4 kg | 21–24 in53–61 cm |
| 0-6Mcombined size | up to 16 lbup to 7.3 kg | 17–26 in43–66 cm |
| 3-6M | 12–16 lb5.4–7.3 kg | 24–26 in61–66 cm |
| 6-9M | 16–20 lb7.3–9.1 kg | 26–28 in66–71 cm |
| 12M | 20–24 lb9.1–10.9 kg | 28–30 in71–76 cm |
| 18M | 24–28 lb10.9–12.7 kg | 30–32 in76–81 cm |
| 24M/2T | 28–32 lb12.7–14.5 kg | 32–34 in81–86 cm |
Gerber also sells a combined 0-6M size, and its cotton pajamas use their own, snugger chart (below).
Burt's Bees Baby · Baby clothes
| Size | Weight | Length |
|---|---|---|
| Preemie | up to 6 lbup to 2.7 kg | up to 17 inup to 43 cm |
| NB | 6–9 lb2.7–4.1 kg | up to 21.5 inup to 55 cm |
| 0-3M | 9–12.5 lb4.1–5.7 kg | 21.5–24 in55–61 cm |
| 3-6M | 12.5–17 lb5.7–7.7 kg | 24–26.5 in61–67 cm |
| 6-9M | 17–21 lb7.7–9.5 kg | 26.5–28.5 in67–72 cm |
| 12M | 21–25 lb9.5–11.3 kg | 28.5–30.5 in72–77 cm |
| 18M | 25–28 lb11.3–12.7 kg | 30.5–32.5 in77–83 cm |
| 24M | 28–30 lb12.7–13.6 kg | 32.5–34 in83–86 cm |
Primary · Baby clothing
| Size | Weight | Length |
|---|---|---|
| 0-3M | 9–12 lb4.1–5.4 kg | 18–23 in46–58 cm |
| 3-6M | 12–15 lb5.4–6.8 kg | 23–25 in58–64 cm |
| 6-12M | 15–22 lb6.8–10.0 kg | 25–29 in64–74 cm |
| 12-18M | 22–27 lb10.0–12.2 kg | 29–31 in74–79 cm |
| 18-24M | 27–30 lb12.2–13.6 kg | 31–33 in79–84 cm |
Primary's baby chart starts at 0-3; it lists no newborn row.
Gerber · Cotton pajamas (snug fit)
| Size | Weight | Length |
|---|---|---|
| 6M | 12–16 lb5.4–7.3 kg | 24–27 in61–69 cm |
| 12M | 16–20 lb7.3–9.1 kg | 27–30 in69–76 cm |
| 18M | 20–24 lb9.1–10.9 kg | 30–33 in76–84 cm |
| 24M/2T | 24–28 lb10.9–12.7 kg | 33–35 in84–89 cm |
Gerber states these garments are designed to fit snug for the child's safety.
Infant and toddler shoe size chart by foot length
Each brand's length for each size, as printed, with the other unit converted by us. Stride Rite prints centimetres only; See Kai Run and Robeez print both; Nike, Carter's and Gerber print inches.
Stride Rite · Baby, toddler and little kid
| Size | As stated (length) | Inches | Age shown |
|---|---|---|---|
| 1 | 9.1 cm | 3.58 in | — |
| 2 | 9.9 cm | 3.9 in | 3-6 months |
| 3 | 10.8 cm | 4.25 in | 6-9 months |
| 3.5 | 11.2 cm | 4.41 in | — |
| 4 | 11.6 cm | 4.57 in | 9-12 months |
| 4.5 | 12.0 cm | 4.72 in | — |
| 5 | 12.5 cm | 4.92 in | — |
| 5.5 | 12.9 cm | 5.08 in | — |
| 6 | 13.3 cm | 5.24 in | — |
| 6.5 | 13.7 cm | 5.39 in | — |
| 7 | 14.1 cm | 5.55 in | — |
| 7.5 | 14.6 cm | 5.75 in | — |
| 8 | 15.0 cm | 5.91 in | — |
| 8.5 | 15.4 cm | 6.06 in | — |
| 9 | 15.8 cm | 6.22 in | — |
| 9.5 | 16.3 cm | 6.42 in | — |
| 10 | 16.7 cm | 6.57 in | — |
| 10.5 | 17.1 cm | 6.73 in | — |
| 11 | 17.5 cm | 6.89 in | — |
| 11.5 | 18.0 cm | 7.09 in | — |
| 12 | 18.4 cm | 7.24 in | — |
| 12.5 | 18.8 cm | 7.4 in | — |
| 13 | 19.2 cm | 7.56 in | — |
| 13.5 | 19.6 cm | 7.72 in | — |
Stride Rite's chart also has width (M, W, XW); this finder reads length only.
See Kai Run · First walker, toddler and preschool
| Size | As stated (foot length) | Inches |
|---|---|---|
| 3 | 10.5cm / 4 1/8" | 4.13 in |
| 3.5 | 10.9cm / 4 3/8" | 4.29 in |
| 4 | 11.3cm / 4 1/2" | 4.45 in |
| 4.5 | 11.7cm / 4 5/8" | 4.61 in |
| 5 | 12.1cm / 4 3/4" | 4.76 in |
| 5.5 | 12.5cm / 5" | 4.92 in |
| 6 | 12.9cm / 5 1/8" | 5.08 in |
| 6.5 | 13.4cm / 5 1/4" | 5.28 in |
| 7 | 13.8cm / 5 1/2" | 5.43 in |
| 7.5 | 14.2cm / 5 5/8" | 5.59 in |
| 8 | 14.6cm / 5 3/4" | 5.75 in |
| 8.5 | 15.1cm / 6" | 5.94 in |
| 9 | 15.5cm / 6 1/8" | 6.1 in |
| 9.5 | 15.8cm / 6 1/4" | 6.22 in |
| 10 | 16.2cm / 6 3/8" | 6.38 in |
| 10.5 | 16.6cm / 6 1/2" | 6.54 in |
| 11 | 17.1cm / 6 3/4" | 6.73 in |
| 11.5 | 17.5cm / 6 7/8" | 6.89 in |
| 12 | 17.9cm / 7" | 7.05 in |
| 12.5 | 18.3cm / 7 1/4" | 7.2 in |
| 13 | 18.7cm / 7 3/8" | 7.36 in |
| 13.5 | 19.1cm / 7 1/2" | 7.52 in |
See Kai Run states its chart already includes growing room.
Nike · Babies and toddlers (C sizes)
| Size | As stated (foot length) | cm | Age shown |
|---|---|---|---|
| 1C | 3 9/16 | 9.0 cm | 3 months |
| 2C | 3 15/16 | 10.0 cm | 6 months |
| 3C | 4 4/16 | 10.8 cm | 9 months |
| 4C | 4 9/16 | 11.6 cm | 12 months |
| 5C | 4 15/16 | 12.5 cm | 18 months |
| 6C | 5 4/16 | 13.3 cm | 24 months |
| 7C | 5 9/16 | 14.1 cm | 36 months |
| 8C | 5 15/16 | 15.1 cm | — |
| 9C | 6 4/16 | 15.9 cm | — |
| 10C | 6 9/16 | 16.7 cm | — |
| 10.5C | 6 12/16 | 17.1 cm | — |
| 11C | 6 15/16 | 17.6 cm | — |
| 11.5C | 7 1/16 | 17.9 cm | — |
| 12C | 7 4/16 | 18.4 cm | — |
| 12.5C | 7 7/16 | 18.9 cm | — |
| 13C | 7 9/16 | 19.2 cm | — |
| 13.5C | 7 12/16 | 19.7 cm | — |
Carter's · Baby shoes
| Size | As stated (foot length) | cm | Age shown |
|---|---|---|---|
| 0 | 3.5" | 8.9 cm | Newborn |
| 1 | 3.7" | 9.4 cm | 0-3 months |
| 2 | 4.1" | 10.4 cm | 3-6 months |
| 3 | 4.5" | 11.4 cm | 6-9 months |
| 4 | 4.8" | 12.2 cm | 9-12 months |
Carter's · Every Step and First Walkers
| Size | As stated (foot length) | cm | Age shown |
|---|---|---|---|
| 2 | 3.75" | 9.5 cm | 3-12 months |
| 2.5 | 4" | 10.2 cm | 3-12 months |
| 3 | 4.13" | 10.5 cm | 3-12 months |
| 3.5 | 4.25" | 10.8 cm | 3-12 months |
| 4 | 4.5" | 11.4 cm | 9-24 months |
| 4.5 | 4.63" | 11.8 cm | 9-24 months |
| 5 | 4.75" | 12.1 cm | 9-24 months |
| 5.5 | 5" | 12.7 cm | 9-24 months |
| 6 | 5.13" | 13.0 cm | 9-24 months |
Carter's · Toddler and kids shoes
| Size | As stated (foot length) | cm |
|---|---|---|
| 2 | 3.75" | 9.5 cm |
| 3 | 4" | 10.2 cm |
| 4 | 4.25" | 10.8 cm |
| 5 | 4.75" | 12.1 cm |
| 6 | 5.125" | 13.0 cm |
| 7 | 5.5" | 14.0 cm |
| 8 | 5.75" | 14.6 cm |
| 9 | 6.125" | 15.6 cm |
| 10 | 6.5" | 16.5 cm |
| 11 | 6.75" | 17.1 cm |
| 12 | 7.125" | 18.1 cm |
| 13 | 7.5" | 19.1 cm |
Gerber · Baby shoes
| Size | As stated (sole length) | cm | Age shown |
|---|---|---|---|
| 0 | 3.25" | 8.3 cm | NB |
| 1 | 3.5" | 8.9 cm | 0-3M |
| 2 | 3.75" | 9.5 cm | 3-6M |
| 3 | 4.125" | 10.5 cm | 6-9M |
| 4 | 4.5" | 11.4 cm | 9-12M |
| 5 | 4.75" | 12.1 cm | 18M |
| 6-7 | 5.25" | 13.3 cm | 2T |
| 8-9 | 5.75" | 14.6 cm | 3T |
Gerber gives sole length, which its shoe guide says to measure on the baby's foot with a soft tape. Sizes 6-7 and 8-9 are single combined sizes.
Robeez · Soft Soles
| Size | As stated (foot length (up to)) | cm | Age shown |
|---|---|---|---|
| 1 | up to 4" / 9.8 cm | 10.2 cm | 0-6 months |
| 2 | up to 4 7/8" / 11.4 cm | 12.4 cm | 6-12 months |
| 3 | up to 5 1/8" / 12.4 cm | 13.0 cm | 12-18 months |
| 4 | up to 5 1/2" / 13.4 cm | 14.0 cm | 18-24 months |
Robeez prints inches and centimetres side by side, and they do not all agree (4 7/8 in is about 12.4 cm, not the 11.4 cm shown). The finder uses the inches.
Robeez · First Kicks
| Size | As stated (foot length (up to)) | cm | Age shown |
|---|---|---|---|
| 3 | up to 4 1/8" / 10.5 cm | 10.5 cm | 6-9 months |
| 4 | up to 4 1/2" / 11.4 cm | 11.4 cm | 9-12 months |
| 5 | up to 4 3/4" / 12.4 cm | 12.1 cm | 12-18 months |
| 6 | up to 5 1/4" / 13.4 cm | 13.3 cm | 18-24 months |
Robeez describes First Kicks as a snug, narrower, shoe-like fit. Its page lists sizes 3 to 6.
How each brand runs, in its own words
Only what the brand itself states. We do not try clothes or shoes on babies, so we make no “runs small” claims of our own.
- Gerber: When in doubt, Gerber says it may help to size up: a baby can grow into clothes, but clothes that are too small are hard to keep comfortable. Its cotton pajamas are cut snug and have their own chart. Source
- Burt's Bees Baby: Burt's Bees Baby says to go by height and weight when you know them, that a baby may still fit 0-3 months after 3 months (or outgrow it sooner), and that a child in a higher percentile for weight or height may want the next size up. Source
- Primary: Primary says the size chart on each product page gives a range of estimated heights and weights for each size, and that its team can suggest a size by phone from your child's height, weight and the size they wear in other brands. Source
- Stride Rite: Stride Rite says its shoes run true to size, that a child between sizes (or with one foot bigger) should get the bigger size, and that children's feet can grow half a size every 2 to 4 months, so it suggests measuring every two months. Source
- See Kai Run: See Kai Run says its chart already allows for growing room, and to order a size up if the foot lands between two sizes. Source
- Nike: Nike says to measure both feet, use the longer one, and size up if you are between sizes. Source
- Robeez: Robeez describes First Kicks as having shoe-like sizing with a snug, narrower fit. Source
Where the charts disagree
- Newborn: 6–9 lb in Carter's and Burt's Bees Baby; 5–8 lb in Gerber.
- 0-3 months: 9–12.5 lb in Carter's and Burt's Bees Baby; 8–12 lb in Gerber; 9–12 lb in Primary.
- Gerber pajamas: Gerber's cotton pajama chart puts 12–16 lb in 6M, where its clothing chart calls the same weight 3-6M, and it starts at 6M. Check the sleepwear chart separately.
- Carter's vs Burt's Bees Baby: through 24 months the two weight ranges match size for size (12.5–17 lb for 6M at Carter's, 12.5–17 lb for 3-6M at Burt's Bees Baby), but the length ranges differ slightly.
- Shoe size 3: 10.8 cm at Stride Rite, 10.5 cm at See Kai Run, 4.13 in in Carter's Every Step but 4 in in Carter's toddler shoes, and up to 5.13 in in Robeez Soft Soles against 4.13 in in Robeez First Kicks.
- Nike's C sizes: 1C is 3.56 in at Nike, and Nike labels sizes 1C to 7C with an age (3 to 36 months).
Not in the chart
- Old Navy and Gap: We could not reach a readable copy of their baby clothing size charts (they load inside the shopping pages, which refused our requests), and the Old Navy baby shoe chart is a printable ruler with no lengths printed, so there were no numbers we could read and cite.
- H&M: hm.com refuses automated requests and the archived copies of its baby size guide do not include the chart, so it is left out rather than copied from a third-party site.
- Kyte Baby: Its sizing chart is published as an image, not text we could check line by line.
How the finder works
Clothes. Each brand's chart is matched separately on weight and on length, bounds inclusive. When the two point to different sizes, or a weight sits exactly on the line between two sizes, the finder shows both and suggests the bigger one. Combined sizes such as Gerber's 0-6M are shown as an alternative, not the main answer.
Age. Age is optional and only reads the label: a 4-month-old matches 3-6M. Labels that name a single month (Carter's 6M) are read as the three months before it, which is how Carter's own costume chart names the same ranges. Brands say to size by weight and length, so the age line never overrides them.
Shoes. The finder picks the smallest size whose listed length is at least your baby's foot, which is the “between sizes, go up” rule Stride Rite, See Kai Run and Nike each state. It works in whichever unit the brand prints and converts at 2.54 cm to the inch. The “room” figure is our subtraction (listed length minus foot), not a brand figure, and See Kai Run says its chart already includes growing room.
Measuring. Stride Rite and Nike both say to measure heel to the longest toe on both feet and use the longer foot. Gerber gives a sole length and says to measure the bottom of the foot with a soft tape. This page covers sizing only; for questions about feet or growth, ask your pediatrician.
Sleep sacks and swaddles we recommend
Wearable blankets come in sizes too, with each maker's own weight chart, so pick the size on the listing by your baby's weight. These are the picks from our sleep essentials guide.
Kyte Baby Sleep Bag in Bamboo Rayon
Why we picked it
Love to Dream Swaddle UP
Why we picked it
HALO SleepSack 100% Cotton Wearable Blanket (0.5 TOG, Small)
Why we picked it
Common questions
What size clothes does a newborn wear?
Newborn (NB) size: 6–9 lb in Carter's and Burt's Bees Baby; 5–8 lb in Gerber. Primary lists no newborn size and starts at 0-3 months (9–12 lb). Most brands also sell Preemie for smaller babies: up to 5 lb at Gerber and up to 6 lb at Carter's.
What weight is 0-3 months in baby clothes?
0-3 months is 9–12.5 lb in Carter's and Burt's Bees Baby; 8–12 lb in Gerber; 9–12 lb in Primary. At 12 lb that already puts a baby at the top of 0-3 months in some charts and into the next size in others: 3M at Carter's, 3-6M at Gerber, 0-3M at Burt's Bees Baby, 3-6M at Primary.
Should I buy baby clothes by age or weight?
By weight and length. Burt's Bees Baby says to use height and weight when you know them, and that a baby may still fit 0-3 months after three months or outgrow it sooner. When weight and length point to different sizes, this finder suggests the bigger one, in line with Gerber's advice to size up when in doubt.
How do I find my baby's shoe size?
Measure the foot from the heel to the longest toe, on both feet, and use the longer one. Stride Rite, See Kai Run and Nike all say to choose the bigger size when a foot falls between two. Enter that length in the Shoes tab to see the size in each brand.
Do baby shoe sizes match across brands?
Not exactly. Size 3 is listed at 10.8 cm by Stride Rite, 10.5 cm by See Kai Run, up to 5.13 in in Robeez Soft Soles and up to 4.13 in in Robeez First Kicks. Even Carter's own charts differ: size 3 is 4.13 in in Every Step and 4 in in its toddler shoes. Measure, then read each brand's chart.
How often should I check my baby's shoe size?
Stride Rite says children's feet can grow half a size every 2 to 4 months and suggests measuring every two months. Recheck before each new pair.
Sources
Every chart below was opened and read on 2026-10-26. carters.com refuses automated requests, so Carter's chart was read from the Internet Archive's copy, dated alongside the link. Primary's chart opens from the size guide on its product pages.
Carter's bodysuits and one-pieces
- Carter's size chart (Bodysuits; Pajamas; Baby Shoes; Every Step and First Walkers; Toddlers and Kids Shoes) (archived copy, 2026-10-05)
Last checked: 2026-10-26
Gerber clothing
Last checked: 2026-10-26
Primary baby clothing
Last checked: 2026-10-26
Gerber cotton pajamas (snug fit)
Last checked: 2026-10-26
Stride Rite Baby, toddler and little kid shoes
- Stride Rite kids' shoe sizing help (length chart in centimeters)
- Stride Rite FAQs: do Stride Rite shoes run true to size?
Last checked: 2026-10-26
See Kai Run First walker, toddler and preschool shoes
Last checked: 2026-10-26
Nike Babies and toddlers (C sizes) shoes
Last checked: 2026-10-26
Carter's Baby shoes shoes
- Carter's size chart (Bodysuits; Pajamas; Baby Shoes; Every Step and First Walkers; Toddlers and Kids Shoes) (archived copy, 2026-10-05)
Last checked: 2026-10-26
Carter's Every Step and First Walkers shoes
- Carter's size chart (Bodysuits; Pajamas; Baby Shoes; Every Step and First Walkers; Toddlers and Kids Shoes) (archived copy, 2026-10-05)
Last checked: 2026-10-26
Carter's Toddler and kids shoes shoes
- Carter's size chart (Bodysuits; Pajamas; Baby Shoes; Every Step and First Walkers; Toddlers and Kids Shoes) (archived copy, 2026-10-05)
Last checked: 2026-10-26
Gerber Baby shoes shoes
- Gerber Childrenswear size chart (clothing, cotton pajamas and shoes)
- Gerber Childrenswear: how do baby shoe sizes work
Last checked: 2026-10-26