
Sizing Guide for Nappies
NAPPIES
Your super soft Pura nappies should fit snugly while still giving your little one the freedom to roll, kick, and crawl comfortably.
It may be time to move up a size if:
- The waistband sits low on your baby’s tummy or slips down easily
- The tabs barely fasten at the front of the nappy
- The nappy leaves deep red marks or irritation on the waist or thighs
- You notice more leaks, especially overnight or around the back
- Your baby seems uncomfortable or restricted in their nappy
Your baby may need a smaller size if:
- The nappy sags around the legs or bottom
- There are gaps around the waist or legs
- The tabs overlap significantly when fastened
- Leaks happen because the fit feels too loose
Get even more advice on our Pura parenting blog here.

Sizing Guide for Nappy Pants
NAPPY PANTS
Nappy pants should fit just as snugly and comfortably as regular nappies, while allowing your little one the freedom to toddle, walk and play.
It may be time to move up a size if:
- The pants leave deep red marks or irritation
- You’re noticing more leaks or blowouts
- The waistband sits low on the tummy
- The fit feels tight around the waist or legs
- Your baby seems uncomfortable or restricted
Your baby may need a smaller size if:
- The pants sag between the legs
- There are gaps around the waist or legs
- Leaks happen because the fit feels loose
- The pants slide down during movement
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How to check the fit:
For both nappies and nappy pants:
- The waistband should sit just below your baby’s belly button
- The fit should feel snug but not tight
- You should be able to comfortably slide a finger inside the waistband
- Check around the legs to make sure the ruffles and inner leg cuffs are pulled out, not tucked in
- The leg cuffs should sit neatly in your baby’s leg creases
- The absorbent core should lie flat without bunching
- Your baby’s bottom should be fully covered
- The nappy or pants should stay securely in place while allowing your baby to move freely
For taped nappies:
- The tabs should fasten evenly and securely at the front
For nappy pants:
- The waistband should sit smoothly against the skin without rolling or twisting
Not sure whether to choose nappies or pants? Read our handy blog guide.
The Golden Rule
You can find our size guides on our nappy and nappy pants product pages. Every baby is different, and weight guides are only a starting point. Body shape, movement, and growth spurts can all affect sizing, so always use fit and comfort as your best guide.
If you’re between sizes, try both to see which gives your baby the best fit and leak protection. And if you need any further help or advice – don’t hesitate to drop us a line.






