What size diaper for a 15 lb baby?

A 15 lb (6.8 kg) baby typically wears a Size 2 diaper. Pampers Size 2 fits 12–18 lbs; Huggies Size 2 fits 12–18 lbs as well. However, fit is more important than weight alone — if you see red marks on the thighs, the diaper is too small. If the tabs barely reach center or the diaper sags, it is too large.

How do I convert diaper sizes from US to European?

European diapers are sized by weight in kilograms rather than US size numbers. US Newborn ≈ EU Mini (3–6 kg). US Size 1–2 ≈ EU Midi (4–9 kg). US Size 3–4 ≈ EU Maxi (7–18 kg). US Size 5 ≈ EU Junior (11–25 kg). Always check the weight range on the package, as brand ranges overlap significantly.

When should I size up in diapers?

Size up when: (1) the current diaper leaves red marks on your baby's waist or thighs; (2) you cannot fit two fingers under the waistband; (3) leaks are occurring frequently despite correct fit; (4) the tabs are nearly touching in the center. Do not wait until your baby exceeds the top weight listed — fit and comfort matter more than the number on the package.

Diaper Size Guide: US & European Sizes, Weight Ranges by Brand

US Diaper Sizes by Brand and Weight

US diaper sizes are numbered 0 (Newborn) through 7, with weight ranges that overlap significantly between consecutive sizes. Brands also overlap: a baby at 22 lbs could fit Size 3, 4, or even 5 depending on the brand and fit. The table below shows official brand weight ranges as published by the manufacturers.

US Size	Pampers (lbs)	Huggies (lbs)	Weight Range (kg)	Typical Age
Newborn (NB)	Up to 10 lb	Up to 10 lb	Up to 4.5 kg	Birth–4 weeks
Size 1	8–14 lb	8–14 lb	3.6–6.4 kg	2–4 months
Size 2	12–18 lb	12–18 lb	5.4–8.2 kg	3–8 months
Size 3	16–28 lb	16–28 lb	7.3–12.7 kg	5–24 months
Size 4	22–37 lb	22–37 lb	10–16.8 kg	18–36 months
Size 5	27+ lb	27+ lb	12.3+ kg	2–4 years
Size 6	35+ lb	35+ lb	15.9+ kg	3+ years
Size 7	41+ lb	41+ lb	18.6+ kg	4+ years

EU / International Diaper Size Equivalents

European (and most international) brands — including Pampers European editions, Huggies EU, and local brands like Libero and Lillydoo — use named sizes with kilogram weight ranges. These are the standard EU sizing categories.

EU Size Name	Weight Range (kg)	Weight Range (lbs)	US Size Equivalent
Mini (Size 1)	3–6 kg	6.6–13.2 lb	Newborn / Size 1
Midi (Size 2)	4–9 kg	8.8–19.8 lb	Size 1–2
Midi Plus (Size 3)	5–10 kg	11–22 lb	Size 2–3
Maxi (Size 4)	7–18 kg	15.4–39.7 lb	Size 3–5
Maxi Plus (Size 4+)	9–20 kg	19.8–44.1 lb	Size 4–5
Junior (Size 5)	11–25 kg	24.3–55.1 lb	Size 5–6
Junior Plus (Size 5+)	12–27 kg	26.5–59.5 lb	Size 6–7

How to Tell If the Fit Is Right

Weight ranges are guidelines, not rules. A diaper fits correctly when:

The waistband sits at or just below the belly button
Two fingers fit comfortably under the waistband
The leg cuffs are snug but not cutting into the skin
The tabs fasten in the middle of the landing zone (not at the edge)
There are no gap spaces around the legs

If you notice red marks or frequent blowouts even at a correct weight, try a different brand — leg cut and rise vary noticeably between Pampers, Huggies, and store brands.

Convert baby weight between lbs and kg with our weight converter.