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Size Guide

Find the right fit with our diaper calculator and size guide.

Diaper Calculator

Choose to view as kilograms or pounds then slide across to select your baby’s weight. Find the right size and an estimate of how many diapers they’ll use per day.

Kg
Lbs

Recommended diaper size*

1

SIZE 1

3 - 5kg

6 - 11lbs

2

SIZE 2

4 - 6kg

9 - 18lbs

3

SIZE 3

6 - 11kg

13 - 25lbs

4
2^T-3^T

SIZE 4
SIZE 2^T-3^T

9 - 15kg

20 - 34lbs

5
3^T-4^T

SIZE 5
SIZE 3^T-4^T

12 - 18kg

28 - 40lbs

6
4^T-5^T

SIZE 6
SIZE 4^T-5^T

16+ kg

35+ lbs

Average number of diapers per day*

Diapers

Recommended Products

Premium Diapers

Designed for serious performance, our premium diapers will take care of the mess. Made with an absorbent 3D core, unique deep pocket and high back waistband for up to 12 hour leak protection.

View Premium Diapers

Overnight Diapers

Designed for dreaming, sleeping and wriggling little humans, our Overnights diapers have you covered for leak-free sleeps. Made with advanced overnight protection to keep leaks contained, skin dry & your little one comfy all night long!

View Overnight Diapers

CoComelon Premium Training Pants

Rascal + Friends CoComelon training pants are designed for little humans on the move. Made with an extra stretchy waistband, up to 12 hour leak protection and easy on + off design. Coming soon!

View Training Pants

Size Range

Diapers

1 3-5kg
6-11 lbs

2 4-8kg
9-19 lbs

3 6-11kg
13-24lbs

4 10-15kg
22-33lbs

5 13-18kg
28-39lbs

6 15-20kg
33-44lbs

7 17kg+
37+lbs

Training Pants

4
2^T-3^T 9-15kg
20-34lbs

5
3^T-4^T 14-18kg
32-40lbs

6
4^T-5^T 16+kg
36+lbs

Not sure what size to choose?

We recommend choosing a diaper size based on your baby’s weight. If you’re between sizes, try the smaller size first. If you still have questions, our Customer Love team are always here to help. Send us a message with your details, and we’ll help you find the right fit.

*The recommended diaper size and quantity is a guide only.

Ready to join the fun? We've teamed up with our friends at CoComelon to bring you training pants that are seriously good and seriously fun.

Featuring JJ & friends in our limited edition print.

Shop Now

Ready to join the fun? We've teamed up with our friends at CoComelon to bring you training pants that are seriously good and seriously fun.

Featuring JJ & friends in our limited edition print.

Shop Now

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Still dealing with leaking diapers?

Get advanced absorption and overnight leak protection with Rascal + Friends premium diapers.

Unique 3D Core Technology

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Premium Original Nappy	Premium Eco Nappy
Gentle and absorbent topsheet	Gentle and absorbent plant-based topsheet
Non-woven fabric wrapped core	Sustainable tissue wrapped core
Water resistant and breathable film	Plant-based, water resistant and breathable biofilm
Soft and breathable backsheet	Soft and breathable plant-based backsheet
Soft recyclable packaging	Home/commercially compostable packaging
3D core containing sustainable pulp	Core containing sustainable pulp
Double leak guards	✓
Soft leg cuffs for a comfortable fit	✓
No lotions, fragrance or latex	✓
Highback Waistband	✓
Custom designed grip tabs	✓
Up to 12 hours leakage protection*	✓

*Hours may vary according to individual baby’s urine amount

Size Guide