Children’s Diaper & Nappy Sizing & Measurement Matrix

Comprehensive reference matrix mapping baby diapers, infant nappies, training pants, and swim diaper brackets against standard body weight ranges and age milestones.

Children’s Diaper & Nappy Standard Specifications

Detailed breakdown of standardized sizing brackets, weight range correlations, and age specifications for baby diapers, disposable training pants, and reusable cloth nappies.

United States	Europe	United Kingdom	Italy	France	Australia	Japan	South Korea	China	Brazil	Mexico	International	Min Weight ( $\text{kg}$ )	Max Weight ( $\text{kg}$ )	Min Weight ( $\text{lbs}$ )	Max Weight ( $\text{lbs}$ )	Min Age ( $\text{months}$ )	Max Age ( $\text{months}$ )
Preemie	P	Preemie	P	P	Preemie	Preemie	Preemie	NB	RN	P	NB	1	2.7	2	6	0	1
Newborn	1	0-1	1	1	0-1	0	0	S	RN	RN	S	2.5	4.5	5	10	0	1
Size 1	2	1	2	2	1	1	1	S	P	CH	S	3.6	6.4	8	14	0	3
Size 2	3	2	3	3	2	2	2	M	M	M	M	5.4	8.2	12	18	2	6
Size 3	4	3	4	4	3	3	3	L	G	G	L	7.3	12.7	16	28	6	12
Size 4	5	4	5	5	4	4	4	XL	XG	XG	XL	10	16.8	22	37	12	24
Size 5	6	5	6	6	5	5	5	XXL	XXG	XXG	XXL	12.2	20	27	45	18	36
Size 6	7	6	7	7	6	6	6	XXXL	XXG	XXG	XXXL	15.9	25	35	55	24	48

* Sizing can vary significantly between international brands and regional manufacturers. Use this matrix as a baseline reference for standard proportional conversions.

Interpreting Children’s Diaper & Nappy Dimensions

Standardizing children’s diapers and nappies requires correlating infant body weight thresholds with appropriate age brackets. Because little ones grow along varying weight curves, sizing transitions from preemie and newborn tiers through infant and toddler stages.

When utilizing this matrix for product selection or size conversion, reference the minimum and maximum weight capacities in kilograms ( $\text{kg}$ ) and pounds ( $\text{lbs}$ ) alongside approximate age brackets to account for brand-specific absorbency cuts across international markets.

Indexed Sizing Tiers & Dimensions

PreemieSize

Weight: 1–2.7 kg (2–6 lbs), Age: 0–1 mos mapping for US size Preemie

Symbol: PreemieBase Value: 1

NewbornSize

Weight: 2.5–4.5 kg (5–10 lbs), Age: 0–1 mos mapping for US size Newborn

Symbol: NewbornBase Value: 2.5

Size 1Size

Weight: 3.6–6.4 kg (8–14 lbs), Age: 0–3 mos mapping for US size Size 1

Symbol: Size 1Base Value: 3.6

Size 2Size

Weight: 5.4–8.2 kg (12–18 lbs), Age: 2–6 mos mapping for US size Size 2

Symbol: Size 2Base Value: 5.4

Size 3Size

Weight: 7.3–12.7 kg (16–28 lbs), Age: 6–12 mos mapping for US size Size 3

Symbol: Size 3Base Value: 7.3

Size 4Size

Weight: 10–16.8 kg (22–37 lbs), Age: 12–24 mos mapping for US size Size 4

Symbol: Size 4Base Value: 10

Size 5Size

Weight: 12.2–20 kg (27–45 lbs), Age: 18–36 mos mapping for US size Size 5

Symbol: Size 5Base Value: 12.2

Size 6Size

Weight: 15.9–25 kg (35–55 lbs), Age: 24–48 mos mapping for US size Size 6

Symbol: Size 6Base Value: 15.9