Use your child's age, height, weight or body measurements to find a clothing size. Age is a good starting point, but height and measurements are more reliable, because each brand uses its own size chart. The typical ranges below come from 56 US and Canadian brands' published charts.
How to read this chart: the height and weight ranges are BabySizeFinder's cross-brand median ranges, calculated from published brand size charts. They are not an official US sizing standard and don't reproduce any single manufacturer's chart.
Kids clothing size chart, US sizes 2T to 16: age, letter size, height, weight, chest and waist
Age
US size
Alpha size
Height
Weight
Chest
Waist
2
2T47 brands analyzed
—
33–36 in45 brands
29–31 lb43 brands
21 in15 brands
21 in17 brands
3
3T48 brands analyzed
—
36–38.5 in47 brands
31–34 lb43 brands
21.5 in16 brands
21.5 in18 brands
4
4T46 brands analyzed
—
39–41.5 in44 brands
34–38 lb41 brands
22 in16 brands
22 in18 brands
4
410 brands analyzed
XS or S2 of 5 brands
38.5–41.5 in10 brands
34–38 lb10 brands
22 in5 brands
21.5 in4 brands
5
5T29 brands analyzed
—
41.5–44 in28 brands
38–42 lb26 brands
23 in8 brands
22.5 in8 brands
5
523 brands analyzed
XS3 of 8 brands
41–44 in23 brands
40–44 lb19 brands
23.5 in11 brands
22.5 in13 brands
6
630 brands analyzed
S6 of 13 brands
44.5–47.5 in29 brands
44–50 lb23 brands
24.5 in14 brands
23 in16 brands
6–7
6X11 brands analyzed
—
46.5–48.5 in11 brands
49–53 lb7 brands
25 in5 brands
23.5 in6 brands
7
723 brands analyzed
S7 of 13 brands
48–51 in23 brands
50–58 lb17 brands
26 in9 brands
23.5 in11 brands
8
831 brands analyzed
S8 of 14 brands
50.5–53 in29 brands
58–67 lb23 brands
27 in13 brands
24.5 in15 brands
9–10
1028 brands analyzed
M8 of 15 brands
53–56 in26 brands
67–80 lb22 brands
28.5 in12 brands
25 in14 brands
11–12
1228 brands analyzed
L9 of 14 brands
56–59.5 in27 brands
80–94 lb22 brands
30 in12 brands
26 in13 brands
13–14
1425 brands analyzed
XL or L7 of 14 brands
59–62 in24 brands
93–106 lb19 brands
31.5 in11 brands
27.5 in12 brands
15–16
1615 brands analyzed
L or XL6 of 11 brands
61.5–63.5 in15 brands
105–118 lb11 brands
33 in7 brands
29 in8 brands
For each size, BabySizeFinder calculates the median published lower limit and the median published upper limit across the brands that offer that size. This creates a central cross-brand reference range rather than reproducing any single brand's chart. "Typical" on this page means this median range. It is not a typical child's body measurement or a growth norm.
The number of brands included varies by size, and by measurement: not every brand publishes weight, chest or waist, so each cell shows how many brands it is based on. Sizes with fewer than 10 brands are marked "small sample". Chest and waist are the median of the largest measurement each brand lists for the size, shown only when at least 4 brands publish it. For brands with separate girls' and boys' charts, the two are averaged before the median is taken.
Age is the age each US size is named for. Alpha size is the letter most often printed next to that number, out of the brands that print a letter for it (15 brands in total).
BabySizeFinder calculation from 56 brands' published size charts, checked September and October 2026. A brand's combined "24M / 2T" size counts as its 2T. Where a brand lists one height per size rather than a range, that height counts as the upper limit only.
Not Sure Which Size?
Use the Kids Size Finder
Enter at least one measurement. Height gives the best answer and weight refines it. Age is used only when height and weight are blank, and gives a rough starting point. Decimals are fine. If a brand's chart puts height and weight in different sizes, the finder uses the bigger one, as the BabySizeFinder calculator does.
Kids Clothing Size Chart by Age
Age is only a starting point because the same age can map to different sizes across brands. Check height whenever possible.
Age
Size for this age
Typical height
Typical weight
2 years
2T
33–36 in
29–31 lb
3 years
3T
36–38.5 in
31–34 lb
4 years
4T or 4
39–41.5 in
34–38 lb
5 years
5T or 5
41.5–44 in
38–42 lb
6 years
6 or 6X
44.5–47.5 in
44–50 lb
7 years
7 or 6X
48–51 in
50–58 lb
8 years
8
50.5–53 in
58–67 lb
10 years
10
53–56 in
67–80 lb
12 years
12
56–59.5 in
80–94 lb
14 years
14
59–62 in
93–106 lb
16 years
16
61.5–63.5 in
105–118 lb
US kids' sizes are named after the age they're made for (sizes 10 to 16 cover two ages each). Typical height and weight are the cross-brand median ranges for that size from the main chart. BabySizeFinder calculation.
Height is the most consistently published sizing measurement among the brands in our dataset: 54 of the 56 brands publish height guidance for these sizes. Find your child's height to see the size most of those brands give.
Height
Most common size
Brands agreeing
Brands with guidance
Age on label
Notes
32–36 in
2T
88%
24–47
2
36–38.5 in
3T
78%
47–52
3
38.5–41.5 in
4T
68%
49–52
4
41.5–44 in
5T
50%
42–49
5
Some brands: 5
44–48 in
6
60%
30–34
6
48–50.5 in
7
54%
24–30
7
Some brands: 8
50.5–53 in
8
59%
27–30
8
Some brands: 7, 10
53–56 in
10
69%
26–28
9–10
56–59.5 in
12
70%
24–29
11–12
59.5–62 in
14
61%
23–29
13–14
Some brands: 12, 16
62–64 in
16
71%
8–19
15–16
Some brands: 14
Each row starts just above the previous row's upper value and includes its own upper value, so a child who is exactly 36 in tall is in the first row. Lookup ranges are rounded for readability; the Size Finder uses the underlying measurement data.
How the rows are built: at every 0.05 in (about 1 mm) of height, we checked which size each brand's chart gives, among the brands whose sizing guidance covers that height ("Brands with guidance"). Heights where the same size is most common are grouped into one row. Brands agreeing is the average, across the heights in the row, of the share of those brands that give the most common size. "Some brands" lists other sizes given by at least 15% of them. Brands with separate girls' and boys' charts count once, using the average of the two. BabySizeFinder calculation.
Kids Size Chart by Weight
Weight is useful as a second check, but fewer brands publish weight guidance for older kids' sizes (50 of the 56 brands publish weight for these sizes at all), so sample sizes become smaller. The "Brands with guidance" column shows how many brands each row rests on.
Weight
Most common size
Brands agreeing
Brands with guidance
Age on label
Notes
26–31 lb
2T
90%
17–46
2
31–34 lb
3T
57%
46–49
3
Some brands: 2T
34–39 lb
4T
58%
45–50
4
39–42 lb
5T
55%
43–44
5
Some brands: 5
42–44 lb
5
42%
30–32
5
Some brands: 5T, 6
44–50 lb
6
68%
24–28
6
50–57 lb
7
49%
19–23
7
Some brands: 8, 6X
57–67 lb
8
65%
20–22
8
Some brands: 10
67–80 lb
10
68%
21–23
9–10
Some brands: 12
80–95 lb
12
61%
20–22
11–12
Some brands: 14, 10
95–107 lb
14
71%
16–20
13–14
Some brands: 16
107–120 lb
16
74%
5–17
15–16
Some brands: 14
Built the same way as the height table, at every 0.1 lb (about 45 g), using only brands that publish weight. Rows are continuous and include their upper value; ranges are rounded for readability, and the Size Finder uses the underlying data. Ranges narrower than 1 lb (0.45 kg) are folded into the next row. BabySizeFinder calculation.
Kids Size Comparison Across Popular Brands
Pick a size to see what each brand publishes for it. Only measurements the brand itself publishes are shown, converted to your units, and each brand name links to its size chart.
36 size charts from 30 brands
Scroll the table sideways for chest, waist and date checked →
Sorted from the shortest to the tallest published height range. Some brands publish separate girls' and boys' charts; where those differ, each chart has its own row, so the number of size charts can be higher than the number of brands. "Up to" means the brand gives only a maximum, a single height means the brand lists one height for that size, and "Not published" means the brand gives no value. Brand-published data from each brand's official size guide, or a named retailer's copy of the brand's chart where the brand doesn't publish an accessible one (see How we check sizes).
Why Kids' Clothing Sizes Differ Between Brands
Brands in the US and Canada don't all follow one size chart. Each brand publishes its own, so a size 6 at one brand can list a different height, weight, chest and waist than a size 6 at another. That's why this page goes by measurements and compares brands instead of relying on the age on the label.
Size 6 shows how far apart published charts can be. Among the 34 size 6 charts from 28 brands that publish both a minimum and a maximum height, the ranges run from 42.5 in at the lowest to 49.5 in at the highest. A height of 46.5 in falls above the published size 6 range of Levi's Kids, Nike, Deux par Deux, Magnetic Me, Angel Dear and Under Armour (girls), and below the published size 6 range of Cat & Jack (girls) and Cat & Jack (boys).
Published size 6 height ranges: 34 charts from 28 brands
4244464850
Levi's Kids43–46 in
Nike43–46 in
Deux par Deux44–45.5 in
Magnetic Me43.5–46 in
Angel Dear44–46 in
Burt's Bees Baby42.5–47.5 in
Honest Baby42.5–47.5 in
Under Armour (girls)44–46 in
Gymboree44–46.5 in
Tea Collection44–46.5 in
The Children's Place (girls)44–46.5 in
Tommy Hilfiger (girls)44–46.5 in
Under Armour (boys)44–46.5 in
Calvin Klein (boys)44–47 in
Calvin Klein (girls)44–47 in
Miles the Label44–47 in
Tommy Hilfiger (boys)44–47 in
Guess45–46.5 in
Andy & Evan45–48 in
Appaman45–48 in
Carter's / OshKosh45–48 in
Disney Baby45–48 in
Janie and Jack45–48 in
Loulou Lollipop45–48 in
Old Navy (boys)45–48 in
Otter Avenue45–48 in
The North Face (boys)46–47 in
The North Face (girls)46–47.5 in
Joe Fresh45–49 in
Old Navy (girls)45–49 in
Kate Quinn45.5–49 in
Ralph Lauren46–48.5 in
Cat & Jack (girls)47–49 in
Cat & Jack (boys)47–49.5 in
Each bar is one published size 6 chart, sorted by the middle of its range; brands with separate girls' and boys' charts that differ have a bar for each. The range is written next to each bar. Brand-published ranges, charted by BabySizeFinder.
Original research
The same label covers different heights. In the BabySizeFinder Size Index 2026, among the 19 official, unisex 2T charts that publish both a minimum and a maximum height, the middles of the height ranges span 8.3 cm (3.25 in), with a median of 87.6 cm. The Size Index uses fewer 2T charts than the 47 brands in the main chart because it leaves out retailer copies, girls'- or boys'-only charts and sizes published with only a maximum.
On this page's data, the widest spread is for size 8: among the 40 size 8 charts from 28 brands that publish both a minimum and a maximum height, the middle of the range runs from 47.5 in (Angel Dear) to 54 in (Ralph Lauren (girls)), a difference of 6.5 in. Sizes with fewer than 10 such charts weren't ranked.
AI-generated illustration, not a photo of a real child. Measuring points drawn by BabySizeFinder.
Height. Have your child stand barefoot against a flat wall with heels touching the wall and looking straight ahead. Place a flat book on top of the head, mark the wall and measure from the floor.
Chest. Measure around the fullest part of the chest, under the arms. Keep the tape level and don't pull it tight.
Waist. Measure around the natural waistline, the narrowest part of the torso, usually just above the belly button.
Hips. Measure around the fullest part of the hips and seat, with feet together.
Inseam. Measure from the crotch down the inside of the leg to the ankle. Measuring a pair of pants that fits well works too.
Measure over thin clothing or none, and record the measurement as accurately as practical. The Size Finder accepts decimal measurements.
Boys' and Girls' Kids Size Charts
In the brands we analyzed, younger children's sizing is often shared or very similar, and separate girls' and boys' measurements become more common in larger sizes. 17 brands publish separate girls' and boys' charts. For sizes 2T to 5T, 46 of the 52 girls'/boys' size pairs at these brands list identical height and weight; for sizes 7 to 16, 58 of 64 differ.
Among the 15 brands with both charts for sizes 7 to 16, the median difference between the middle of the girls' and the boys' height range for the same size number is 0.8 in (63 size comparisons). The largest is 4 in (Levi's Kids, sizes 12 and 14).
Girls' sizes
Size
Height
Weight
Brands analyzed
2T
33–35.5 in
29–32 lb
16
3T
36–38 in
32–35 lb
17
4T
38.5–41 in
35–39 lb
16
4
39–41.5 in
35–39 lb
4
5T
41.5–44 in
39–43 lb
6
5
41–44 in
40–45 lb
13
6
44–46.5 in
45–50 lb
15
6X
46.5–48.5 in
49–53 lb
10
7
49–51 in
52–59 lb
12
8
51–53 in
61–68 lb
14
10
53.5–55.5 in
69–83 lb
14
12
56–58 in
83–95 lb
14
14
58–61 in
94–104 lb
13
16
61–62.5 in
105–115 lb
11
Boys' sizes
Size
Height
Weight
Brands analyzed
2T
33.5–35.5 in
29–32 lb
15
3T
36–38.5 in
32–35 lb
16
4T
38–41 in
35–39 lb
15
4
39–41.5 in
34–39 lb
4
5T
41–44 in
39–42 lb
7
5
41–44 in
40–45 lb
11
6
44–47 in
45–50 lb
13
6X
46–48 in
—
2
7
47–50 in
50–55 lb
11
8
50–52.5 in
55–65 lb
12
10
52.5–55.5 in
67–84 lb
11
12
56–58.5 in
82–95 lb
12
14
59–61.5 in
95–109 lb
10
16
62–64 in
104–115 lb
8
Unisex sizes
Size
Height
Weight
Brands analyzed
2T
33–36 in
29–31 lb
31
3T
36–39 in
31–34 lb
31
4T
39–41.5 in
34–38 lb
30
4
38–41 in
33–38 lb
5
5T
41.5–44 in
38–42 lb
22
5
41.5–44.5 in
38–44 lb
10
6
45–48 in
43–50 lb
15
6X
47–49 in
48–53 lb
1
7
48–51 in
50–57 lb
11
8
51–53 in
57–67 lb
17
10
53.5–56 in
67–80 lb
14
12
57–60 in
77–95 lb
14
14
60–62.5 in
92–108 lb
12
16
63–65 in
106–120 lb
4
Girls and Boys use the 17 brands that publish separate charts, plus brands whose chart is for one sex only (Habitual: girls; The Children's Place: girls). Unisex uses brands with one chart for everyone. Ranges are cross-brand medians of published lower and upper limits. BabySizeFinder calculation.
Approximate Kids Size Conversion: US, Canada, UK & EU
International children's clothing size conversions are approximate because sizing systems differ by brand. Many Canadian retailers use the same numbered labels as US retailers, while measurements may also be presented in metric units, so the Canada column repeats the US label (it's hidden on phones). Many UK brands label by age, and many European brands label by the child's height in centimeters.
US
Canada
UK (age)
EU (cm)
Typical height
2T
2T
18–24 months
92
33–36 in
3T
3T
2–3 years
98
36–38.5 in
4T
4T
3–4 years
104
39–41.5 in
5T
5T
4–5 years
110
41.5–44 in
6
6
5–6 years / 6–7 years
116 / 122
44.5–47.5 in
6X
6X
6–7 years
122
46.5–48.5 in
7
7
7–8 years
128
48–51 in
8
8
8–9 years
134
50.5–53 in
10
10
9–10 years / 10–11 years
140
53–56 in
12
12
10–11 years / 11–12 years
146 / 152
56–59.5 in
14
14
11–12 years / 12–13 years
158
59–62 in
16
16
13–14 years
158 / 164
61.5–63.5 in
UK age labels follow Mini Boden's chart and EU centimeter sizes follow H&M's chart. Neither represents every UK or European brand. US matches use BabySizeFinder's cross-brand typical height ranges: each US size is matched to the Mini Boden and H&M sizes whose published height range overlaps it most (two sizes are listed when both overlap substantially). Check the specific brand's chart before buying. BabySizeFinder calculation from brand-published charts.
4T vs Size 4: What's the Difference?
4T and size 4 overlap heavily in published measurements. In the BabySizeFinder dataset, the typical 4T height range is 39–41.5 in, while size 4 is 38.5–41.5 in. 4T belongs to toddler sizing and size 4 to children's sizing, and garment proportions and construction can differ by manufacturer, so check the specific brand when both sizes are available.
Measure
4T
Size 4
Typical height
39–41.5 in
38.5–41.5 in
Typical weight
34–38 lb
34–38 lb
Brands analyzed
46
10 small sample
46 brands in our data publish 4T and 10 publish size 4. 2 brands publish both. Nautica Kids's boys' chart lists 4T at 39–41.5 in and size 4 (labeled “S (4)”) at 39–41.5 in. Tommy Hilfiger's boys' chart lists 4T at 37–39 in and size 4 (labeled “4”) at 39–41 in. Tommy Hilfiger's girls' chart lists 4T at 37–39 in and size 4 (labeled “4”) at 39–41 in. BabySizeFinder calculation (typical ranges) and brand-published data (Nautica Kids, Tommy Hilfiger).
Size 6 vs 6X: What's the Difference?
6X is commonly used as an intermediate size between size 6 and size 7 in some children's clothing systems. It isn't universal: 11 of the 56 brands in our data publish it. In our dataset, 6X appears more often in girls' charts than boys' charts: 8 brands list it only for girls, 2 list it in both their girls' and boys' charts, 1 in a single chart for everyone, and none only for boys.
At all 9 brands that publish both sizes with a minimum and maximum height, the middle of the 6X range is between 2 in and 3.3 in higher than the middle of the size 6 range.
Brand
Size 6 height
Size 6X height
Calvin Klein (girls' chart)
44–47 inlabel “6”
47–48.5 inlabel “6X”
Guess (girls' chart)
45–46.5 inlabel “6 (M)”
47–48.5 inlabel “6x (L)”
Levi's Kids
43–46 inlabel “6”
46–48 inlabel “6X / 7”
Miles the Label
44–47 inlabel “6”
47–49 inlabel “6X / 7”
Nike
43–46 inlabel “6”
46–48 inlabel “6X / 7”
Ralph Lauren (girls' chart)
46–48.5 inlabel “6”
49–50.5 inlabel “6X”
The Children's Place (girls' chart)
44–46.5 inlabel “6 S”
46.5–50.5 inlabel “6X/7 M”
Tommy Hilfiger (girls' chart)
44–46.5 inlabel “6”
46.5–48.5 inlabel “6X”
Under Armour (girls' chart)
44–46 inlabel “6”
46.5–48.5 inlabel “6x”
Height ranges and size labels exactly as each brand publishes them, from the same chart. Brand-published data.
What If My Child Is Between Sizes?
There's no single rule. Which measurement matters most depends on the garment:
Tops: chest and height matter most.
Pants and shorts: waist and inseam matter most. Some brands publish inseam lengths on their own charts.
One-piece garments: height and torso length matter.
Snug-fit pajamas: follow the manufacturer's chart carefully.
Outerwear: some parents prefer extra room, but sizing depends on the brand and on what's worn underneath.
If measurements fall between sizes, check the specific brand's chart because there is no single rule that works for every garment. The brand comparison shows each brand's published numbers.
Opens the BabySizeFinder calculator with that brand's chart, so you can enter your child's measurements. Covers 56 brands.
Kids Size Chart FAQs
What size does a 5-year-old wear?
Start with size 5T (some brands use 5), the US size labeled for age 5. Its cross-brand median range is 41.5–44 in and 38–42 lb. If your child's height is outside that range, go by the size chart by height instead.
What size does a 6-year-old wear?
Start with size 6 (some brands use 6X), the US size labeled for age 6. Its cross-brand median range is 44.5–47.5 in and 44–50 lb. If your child's height is outside that range, go by the size chart by height instead.
What size does a 7-year-old wear?
Start with size 7 (some brands use 6X), the US size labeled for age 7. Its cross-brand median range is 48–51 in and 50–58 lb. If your child's height is outside that range, go by the size chart by height instead.
Is kids clothing size based on age, height or weight?
Mostly height, then weight. Size labels are named after ages, but 54 of the 56 brands in our data publish height guidance and 50 publish weight. Chest and waist matter for fitted tops and pants. Use the size chart by height when you can.
What does 6X mean in kids clothes?
6X is an in-between size, larger than 6 and smaller than 7. At the 9 brands in our data that publish both, the middle of the 6X height range is 2 in to 3.3 in higher than size 6. It appears more often in girls' charts. See size 6 vs 6X.
Is 4T the same as size 4?
Not exactly, though their published measurements overlap heavily: the typical 4T range is 39–41.5 in and size 4 is 38.5–41.5 in. 4T is a toddler size and size 4 a children's size, and construction can differ by brand. See 4T vs size 4.
What size comes after 5T?
Usually size 6. Among the 16 brands in our data that publish 5T and a next size we can match to a US size, 10 go next to size 6, 2 to size 7 and 3 to size 5. The typical size 6 range is 44.5–47.5 in.
Should I choose a larger size if my child is between sizes?
It depends on the garment and the brand. Chest and height matter most for tops, waist and inseam for pants, and snug-fit pajamas should follow the manufacturer's chart. See What if my child is between sizes?
Are kids clothing sizes the same across brands?
No. Each brand publishes its own chart. Among the 34 size 6 charts from 28 brands with a minimum and maximum height, the published ranges run from 42.5 in to 49.5 in. See why sizes differ.
How We Created the BabySizeFinder Kids Size Chart
We review each brand's official size guide. Only when a brand doesn't publish an accessible chart do we use the manufacturer's chart as hosted by a named retailer. We don't use forums, Pinterest, blogs, marketplace seller charts or AI-generated measurements.
We keep each manufacturer's original size labels and original published measurements.
We convert units separately, from the original values, into inches, centimeters, pounds and kilograms. The unit switch on this page converts from one stored value.
We compare equivalent sizes across brands. Brands that share one identical chart, like Carter's and OshKosh B'gosh, count once.
We record the date each source was checked and show it in the brand comparison.
We never fill in missing manufacturer measurements. If a brand doesn't publish a value, it shows as not published.
We separate manufacturer data from BabySizeFinder calculations. Medians, agreement percentages, age references, alpha-size matches and international matches are BabySizeFinder calculations, and each section says which kind of data it shows. Where a calculation needs one value per brand, a brand's girls' and boys' charts are averaged.
This is a clothing-size reference. It is not a growth chart and says nothing about whether a child is growing normally.
Sizing varies by brand, style and garment. BabySizeFinder provides sizing guidance based on published measurements and should be used as a reference rather than a guarantee of fit.
Typical ranges calculated: , from charts checked September and October 2026 · Brand comparison: read from the calculator's size data, last updated ; each row shows when that brand's chart was last checked · Data source: official brand and manufacturer size guides · Brands: 56 US and Canadian brands