Next Kids Size Chart & Free Size Finder

Next actually operates two parallel sizing systems sold side by side: single-year sizes (3, 4, 5, 6...) and dual-year sizes (3-4, 5-6, 7-8...). Most parents don't know both exist, and the difference matters when you're buying online.

We verified Next measurements against official size charts and ran them through a Monte Carlo simulation of 1,000 children to establish where Next sits relative to other major UK brands.

The short answer: Next runs essentially average — right in line with UK sizing norms. The single and dual sizes aren't interchangeable; they're designed for different body shapes within the same height range. Extended sizing (Slim and Plus) is available from age 3 and is one of the best ranges of any UK brand.

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Does Next Run Big or Small?

We compared Next's measurements against a Monte Carlo simulation of 1,000 children across four age bands. The finding is clear: Next sits squarely at the cross-brand average for chest, waist and hip across all height bands.

Brand	Size label	Waist (cm)	Hip (cm)	vs average
Next (single)	5	55	62	Average
Next (dual)	5-6	55–57	62–65	Average
H&M	116	54	60	Average
Zara Kids	111–116	55	62	Average
Tu (Sainsbury’s)	6-7Y	55	61	Average
Tesco F&F	6-7Y	55	62	Average

The UK market is remarkably consistent at this height. Next, H&M, Zara, Tu and Tesco F&F are all within 1–2cm of each other. For the full methodology see our cross-brand sizing research. See also our complete kids clothing size chart comparing 36+ brands side by side.

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Single Sizes vs Dual Sizes: What's the Difference?

Single sizes (3, 4, 5, 6...) — each covers approximately one year's growth, with a fixed single measurement for each dimension. The more precise fit option.

Dual sizes (3-4, 5-6, 7-8...) — each spans two years, with a range of measurements. Designed for children growing through the transition between two single sizes.

The dual sizes are not simply larger versions of the single sizes. The dual size 7-8 covers exactly the measurement range from single size 7 to single size 8 — making it the right choice for a child who sits between the two.

Example: A boy at 122cm with a 58cm chest fits both single size 7 (chest 63cm) and dual size 7-8 (chest 63–67cm). But a boy at 125cm with a 65cm chest fits dual size 7-8 more precisely than either single size 7 (63cm, too tight) or single size 8 (67cm, slightly loose).

Next Boys Tops — Single Sizes

Size	Height (cm)	Chest (cm)
5 lbs	0–44	—
First Size	44–50	—
Up to 1 Month	50–56	—
Up to 3 Months	56–62	—
3-6 Months	62–68	—
6-9 Months	68–74	—
9-12 Months	74–80	—
12-18 Months	80–86	49–51
1.5-2 Years	86–92	51–53
2-3 Years	92–98	53–55
3	95–101	55
4	101–107	57
5	107–113	59
6	113–119	61
7	119–125	63
8	125–131	67
9	131–137	70
10	137–143	73
11	143–149	76
12	149–155	79
13	155–161	82
14	161–167	86
15	167–173	89
16	173–179	92

Boys Tops — Dual Sizes

Size	Height (cm)	Chest (cm)	Waist (cm)	Hips (cm)
3-4	98–104	55–57	53–54	58–60
5-6	110–116	59–61	55–57	62–65
7-8	122–128	63–67	58–60	68–70
9-10	134–140	70–73	62–64	73–76
11-12	146–152	76–79	66–68	79–82
13-14	158–164	82–86	70–72	85–88
15-16	170–176	89–92	74–76	91–94

Next Girls Tops — Single Sizes

Size	Height (cm)	Chest (cm)
5 lbs	0–44	—
First Size	44–50	—
Up to 1 Month	50–56	—
Up to 3 Months	56–62	—
3-6 Months	62–68	—
6-9 Months	68–74	—
9-12 Months	74–80	—
12-18 Months	80–86	49–51
1.5-2 Years	86–92	51–53
2-3 Years	92–98	53–55
3	95–101	55
4	101–107	57
5	107–113	59
6	113–119	61
7	119–125	63
8	125–131	66
9	131–137	69
10	137–143	72
11	143–149	75
12	149–155	79
13	155–161	83
14	161–167	87
15	163–169	89
16	165–171	91

Girls and boys tops are identical through size 7. Girls chest diverges from size 8 onward.

Girls Tops — Dual Sizes

Size	Height (cm)	Chest (cm)	Waist (cm)	Hips (cm)
3-4	98–104	55–57	53–54	58–60
5-6	110–116	59–61	55–57	62–65
7-8	122–128	63–66	58–59	68–71
9-10	134–140	69–72	61–62	74–78
11-12	146–152	75–79	63–64	81–84
13-14	158–164	83–87	65–67	86–92
15-16	166–168	89–91	69–71	94–96

Next Boys Bottoms — Standard

Size	Height (cm)	Waist (cm)	Hip (cm)
12-18 Months	80–86	50–51	52–54
1.5-2 Years	86–92	51–52	54–56
2-3 Years	92–98	52–53	56–58
3	95–101	53	58
4	101–107	54	60
5	107–113	55	62
6	113–119	57	65
7	119–125	58	68
8	125–131	60	70
9	131–137	62	73
10	137–143	64	76
11	143–149	66	79
12	149–155	68	82
13	155–161	70	85
14	161–167	72	88
15	167–173	74	91
16	173–179	76	94

Boys Bottoms — Slim

At size 5, Slim waist is 50cm versus Standard 55cm — a 5cm difference.

Size	Height (cm)	Waist (cm)
3 Slim	95–101	48
4 Slim	101–107	49
5 Slim	107–113	50
6 Slim	113–119	52
7 Slim	119–125	53
8 Slim	125–131	55
9 Slim	131–137	57
10 Slim	137–143	59
11 Slim	143–149	61
12 Slim	149–155	63
13 Slim	155–161	65
14 Slim	161–167	67
15 Slim	167–173	69
16 Slim	173–179	71

Boys Bottoms — Plus

At size 5, Plus waist is 60cm versus Standard 55cm — a 10cm spread across Standard, Slim and Plus.

Size	Height (cm)	Waist (cm)
3 Plus	95–101	58
4 Plus	101–107	59
5 Plus	107–113	60
6 Plus	113–119	62
7 Plus	119–125	63
8 Plus	125–131	65
9 Plus	131–137	67
10 Plus	137–143	69
11 Plus	143–149	71
12 Plus	149–155	73
13 Plus	155–161	75
14 Plus	161–167	77
15 Plus	167–173	80
16 Plus	173–179	83

Next Girls Bottoms — Standard

Size	Height (cm)	Waist (cm)	Hip (cm)
12-18 Months	80–86	50–51	52–54
1.5-2 Years	86–92	51–52	54–56
2-3 Years	92–98	52–53	56–58
3	95–101	53	58
4	101–107	54	60
5	107–113	55	62
6	113–119	57	65
7	119–125	58	68
8	125–131	59	71
9	131–137	61	74
10	137–143	62	78
11	143–149	63	81
12	149–155	64	84
13	155–161	65	86
14	161–167	67	92
15	163–169	69	94
16	165–171	71	96

Girls and boys bottoms are identical through size 7. Girls hips and heights diverge from size 8 onward.

Girls Bottoms — Slim

Next Girls Slim uses hip measurement as the differentiator rather than waist — the only major UK brand to do this. At size 5, Girls Slim hip is 57cm versus standard 62cm.

Size	Height (cm)	Hip (cm)
3 Slim	95–101	53
4 Slim	101–107	55
5 Slim	107–113	57
6 Slim	113–119	60
7 Slim	119–125	63
8 Slim	125–131	66
9 Slim	131–137	69
10 Slim	137–143	73
11 Slim	143–149	76
12 Slim	149–155	79
13 Slim	155–161	83
14 Slim	161–167	87
15 Slim	163–169	89
16 Slim	165–171	91

Girls Bottoms — Plus

Girls Plus uses both waist and hip, giving full measurement guidance for both dimensions.

Size	Height (cm)	Waist (cm)	Hip (cm)
3 Plus	95–101	58	63
4 Plus	101–107	59	65
5 Plus	107–113	60	67
6 Plus	113–119	62	70
7 Plus	119–125	63	73
8 Plus	125–131	64	76
9 Plus	131–137	66	79
10 Plus	137–143	67	83
11 Plus	143–149	68	86
12 Plus	149–155	69	89
13 Plus	155–161	70	93
14 Plus	161–167	72	97
15 Plus	163–169	74	99
16 Plus	165–171	76	101

Next Extended Sizing: Slim and Plus

Next offers one of the broadest extended sizing ranges of any UK children's brand, with Slim and Plus available from size 3 through size 16. Most UK brands either don't offer extended sizing at all or start it from size 7 or 8.

For boys, the differentiator is waist. At size 5, standard waist is 55cm, Slim is 50cm and Plus is 60cm — a 10cm spread across the three fits.

Girls extended sizing works differently. Next Girls Slim uses hip measurement as the primary differentiator rather than waist — making it the only major UK brand to do this. Girls Plus uses both waist and hip.

Which fit is right? If your child's waist measurement falls more than 2–3cm below standard for their height, try Slim. If more than 2–3cm above, try Plus. For girls, check hip against the Girls Slim hip column.

Next Kids Shoe Size Chart

Next uses UK shoe sizing with EU and US equivalents. The label format transitions from standard child sizes to "Jnr" (Junior) at UK 1. UK 13 and UK 1 Jnr are adjacent sizes with no gap.

UK Size	EU	US	Foot length (cm)
UK 3	19	4	11.5
UK 4	20.5	5	12.3
UK 5	21.5	6	13.0
UK 6	23	7	13.8
UK 7	24	8	14.6
UK 8	25.5	9	15.3
UK 9	26.5	10	16.1
UK 10	28	11	16.9
UK 11	29	12	17.6
UK 12	30.5	13	18.4
UK 13	32	1	19.2
UK 1 Jnr	33	2	20.0
UK 2 Jnr	34.5	3	20.9
UK 3 Jnr	35.5	4	21.7
UK 4 Jnr	37	5	22.6
UK 5 Jnr	38	6	23.4
UK 6 Jnr	39	7	24.2

Frequently Asked Questions

Does Next run big or small?

Next runs average — right in line with the UK cross-brand norm. Our Monte Carlo simulation of 1,000 children found no evidence of Next running consistently generous or slim in chest, waist or hip at any age. A Next size 5 fits a child at the same measurement as an H&M 110–116 or a Tu 5-6Y.

What is the difference between Next single sizes and dual sizes?

Single sizes (3, 4, 5...) have fixed measurements for one year’s growth. Dual sizes (3-4, 5-6, 7-8...) have a range of measurements spanning two adjacent single sizes. The dual size is ideal for a child whose measurements fall between two single sizes — not larger or roomier, just covering the middle ground.

When should I choose Slim or Plus at Next?

Choose Slim if your child’s waist (boys) or hip (girls) measures more than 2–3cm below the standard measurement for their height. Choose Plus if they measure more than 2–3cm above. Both are available from size 3 through 16.

What age does size 3 fit at Next?

Next size 3 covers 95–101cm height with a waist of 53cm and hip of 58cm. Most children reach 95cm around age 3, though height varies significantly — always use actual height.

How does Next sizing compare to H&M?

At 112cm, Next size 5 (waist 55cm, hip 62cm) and H&M size 116 (waist 54cm, hip 60cm) are within 1–2cm on both measurements. Both brands sit at the UK average — a child who fits H&M 116 will almost certainly fit Next 5.

Related Size Guides

Does kids clothing run big or small? We measured 30+ brands to find out →Does H&M Kids Run Small? Size Chart 2026 Does Zara Kids Run Small? Size Chart 2026 Tu (Sainsbury's) Kids Size Chart 2026 Does Tesco F&F Run Small? Size Chart 2026

Next Kids Size Chart: Single Sizes, Dual Sizes & Plus