The wrong fit can cause leaks, nappy rash, or discomfort for your little one.
In Australia, Aiwibi offers a full range of high-quality nappies and nappy pants from Size 1 to Size 7, designed to suit
babies at different stages of growth.
Nappy & Nappy Pants Size Chart
| Size | Age (Months) |
Weight |
Waist (cm) |
|---|---|---|---|
| NB（1） | 0-1 | ≤5kg | 33-45 |
| S（2） | 1-3 | 4-8kg | 34-52 |
| M（3） | 4-6 | 6-11kg | 35-54 |
| L（4） | 6-10 | 9-14kg | 36-56 |
| XL（5） | 11-15 | 12-17kg | 37-57 |
| XXL（6） | 15-24 | 15-21kg | 38-58 |
| XXXL（7） | ≥24 | ≥18kg | 41-69 |
Signals for a larger nappy size
Frequent leaks or blowouts
Red marks around waist or thighs
tight or hard to fasten
Baby's weight is near top of size range
Nappy sizes are generally based on weight, but these weight ranges are just for reference. Even at the same weight, babies may have different body shapes, such as height, waist size, or thigh circumference, which can affect the best fit.
How to Measure Your Baby for the Perfect Nappy Size
Weigh your baby
Use a baby scale. Zero it, lay your baby calmly, and record the weight.
Measure the waist
Measure around the narrowest part, keeping the tape snug but leaving space for 1–2 fingers.
Measure the thigh
Measure around the thickest part of the upper thigh.
