Diapers are sized by weight, not age — which is why two babies the same age can wear different sizes. Use this chart to pick the right size, know how many you'll get through, and stop the leaks before they start.
Diaper size chart (by weight)
| Size | Baby weight | Stage |
|---|---|---|
| Newborn (NB) | Up to ~4–5 kg | First few weeks |
| Size 1 / Small | ~4–7 kg | 0–3 months |
| Size 2 / Medium | ~6–10 kg | 3–8 months |
| Size 3 / Large | ~9–14 kg | 8–18 months |
| Size 4 / XL+ | ~12 kg and up | Toddler |
Weight ranges overlap between sizes and vary by brand — always check the pack, and size up if the current pack feels snug.
How many diapers will you use?
Newborns get through a lot: expect 8–12 a day in the first weeks, easing to around 6–8 as they grow. It's worth keeping a good stock — but don't over-buy the smallest size, since babies move up quickly.
- Buy 1–2 packs of Newborn size only (they grow fast)
- Stock up more on Size 1 and Size 2
- Keep wipes and barrier cream on hand for changes
🧷 Shop diapering essentials
Diapers, wipes and changing basics — the right sizes, delivered islandwide with cash on delivery.
Shop diapering →How to avoid leaks (get the fit right)
- The waistband should sit just below the belly button, snug but not tight
- Leg cuffs should be pulled out, not tucked in — this stops leaks
- You should fit two fingers under the waistband comfortably
- Change promptly to protect delicate skin
Time to size up if: you see frequent leaks, red marks on the legs or waist, or the tabs barely reach.
Diaper sizing — FAQs
What size diaper for a newborn?
Start with Newborn (NB) up to ~4–5 kg, then Size 1. Sizes go by weight — check the pack.
How many diapers a day?
8–12 a day for newborns, easing to 6–8 as they grow.
How do I know the size is wrong?
Frequent leaks, red marks, or tabs that barely reach mean it's time to size up.