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.
Nappies 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 |
Nappy Pants Size Chart
| Size | Age (Months) |
Weight |
Waist (cm) |
|---|---|---|---|
| S（2） | 1-3 | 4-8kg | 34-50 |
| M（3） | 4-6 | 6-11kg | 50-53 |
| L（4） | 6-10 | 9-14kg | 53-56 |
| XL（5） | 11-15 | 12-17kg | 56-69 |
| XXL（6） | 15-24 | 15-21kg | ≥59 |
| XXXL（7） | ≥24 | ≥18kg | ≥65 |
When Should You Upgrade to a Larger Nappy Size?
You might want to switch to a larger size in the following situations:
- When the thighs or abdomen feel too tight, leaving marks.
- When the waistband position reaches the outermost side.
- When the nappy crotch shortens or the waistband falls below the belly button.
- When the volume of urine or stools increases and leakage becomes an issue.
- When your baby's weight exceeds the weight range listed for the current size.
Training Pants Usage Guide
For newborns (0-6 months) → Nappies are better for easy changing and nighttime use.
For active babies (6+ months) → Pull-up pants are more convenient for movement and potty training.
For nighttime use → Nappies offer better absorption and leakage protection.
If your baby is active and resists nappy changes, pull-up pants are a great option. However, for long-lasting dryness, especially overnight, nappies are the better choice.
Signals for a larger nappy size
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.
