Diaper Size Calculator
Pick your brand, enter baby's weight, and find the perfect diaper size. Compare Pampers, Huggies, Luvs, Kirkland, and more across US and UK/EU sizing.
Find the perfect fit
What size diaper does baby need?
9 sizes available · Premium
Enter your baby's current weight in pounds
The perfect fit awaits
Select your brand and enter baby's weight to see the recommended diaper size
Pampers Swaddlers Size Chart
Premium option
Brand Comparison
Which sizes each US brand carries
| Brand | Preemie | Newborn | S1 | S2 | S3 | S4 | S5 | S6 | S7 | S8 |
|---|---|---|---|---|---|---|---|---|---|---|
| Pampers Swaddlers | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | — |
| Pampers Baby Dry | — | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| Pampers Cruisers 360 | — | — | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | — |
| Huggies Little Snugglers | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | — | — |
| Huggies Little Movers | — | — | — | — | ✓ | ✓ | ✓ | ✓ | ✓ | — |
| Luvs | — | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | — | — |
| Kirkland Signature (Costco) | — | — | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | — | — |
| Up & Up (Target) | — | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | — |
| Parent's Choice (Walmart) | — | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | — |
| Honest Company | — | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | — | — |
When should I size up?
If you notice frequent blowouts, red marks on baby's skin, or difficulty fastening the tabs, it's probably time to move up a size.
Why do sizes vary by brand?
Each brand designs diapers with different fits, materials, and elasticity. A Size 3 in one brand might fit differently than another. That's why we show brand-specific charts.
Track milestones with Aanvi
From tiny newborn diapers to potty training victories, Aanvi helps you capture every precious moment and share it with family.
Love planning ahead?
Track every milestone with Aanvi
From first kicks to first steps — capture and share your family's precious moments in one beautiful timeline.
Common Questions
- How do I know when to go up a diaper size?
- Signs include frequent leaks or blowouts, red marks on your baby's thighs or waist from tight elastic, difficulty fastening the tabs comfortably, and the diaper looking overly stretched. Move up a size based on fit, not just the weight range on the package.
- What diaper size does a newborn need?
- Most newborns start in newborn size (up to 10 lbs) or size 1 (8-14 lbs). Babies born over 9 pounds may skip newborn size entirely. Don't stock up on newborn diapers — most babies move to size 1 within 2-4 weeks.
- How many diapers does a baby use per day?
- Newborns use 10-12 diapers per day. This drops to about 8-10 per day by 3 months, and 6-8 per day by 6 months. The total in the first year is roughly 2,500-3,000 diapers, with the highest usage in the first 3 months.
For educational purposes only — not a substitute for professional medical advice. Always consult your pediatrician with questions about your child's health.