Wispy Cloud Diapers
Size 4 Diapers
Size 4 fits babies 26+ lb. Choose a weekly bag of 36, a two-bag bundle, or a monthly box of 144. Every pack is the same Wispy Cloud diaper: 3x absorbency, 60% thinner, Totally Chlorine Free.
- Weight
- 26+ lb
- Monthly box
- 144 diapers
- Weekly bag
- 36 diapers
- Subscribe & save
- 20% off box one
Shop Size 4 Diapers9
Alppi Wispy Cloud Diaper Monthly Box
4 (26+ lbs) 144pcs
$105.00
$0.72 / diaper · 144 ct
$89.25 with Subscribe & Save
Alppi Wispy Cloud Diaper Bundles
4 (26+ lbs) 36pcs
$53.70$63.40
$0.74 / diaper · 72 ct
$45.65 with Subscribe & Save
Alppi Rash-Free Diapers
4 (26+ lbs) 144pcs
$105.00
$0.72 / diaper · 144 ct
$89.25 with Subscribe & Save
Diaper + Dry Wipes Value Combo (Monthly)
4 (26+ lbs) 144pcs
$126.96$158.70
$107.92 with Subscribe & Save
Compare packs
Size 4 price per diaper, by pack
Same Wispy Cloud diaper in every pack. Bigger packs and subscriptions cost less per diaper.
Fit check
Is it time to size up?
Red marks
Marks around the legs or waist mean the diaper is getting snug.
More leaks
Leaks or blowouts after a fit check usually mean it's time for the next size.
Tabs barely reach
If the tabs only just reach the landing zone, the next size will fit better.
Weight check
Size 4 is made for 26+ lb. Near the top of the range? Look at the next size.
From the Alppi Journal
Sizing guides
Quick answers
Questions, answered
What weight is Size 4?
Size 4 Alppi diapers fit babies 26+ lb.
How many size 4 diapers come in a box?
A monthly box has 144 diapers and a weekly bag has 36.
How do I know the fit is right?
The waistband sits just below the belly button, the leg guards are pulled out, and two fingers fit under the back waist.
Buying guide
Size 4 Diapers guide
Size 4 diapers are made for growing babies who need a comfortable fit, reliable absorbency, and gentle materials they can wear all day. Alppi Baby pairs advanced protection with alpine‑inspired comfort, so your little one can explore without worry. Â
Size 4 Diapers That Fit Active Babies Perfectly Â
By the time your baby reaches size 4, they’re more active than ever—crawling, climbing, and maybe even taking those first steps. That means their diapers need to fit securely, move with them, and keep leaks away without leaving red marks. Â
What makes the fit work:
- Stretchy waistband that flexes with every wiggle Â
- Soft hook tabs that adjust easily Â
- Gentle leg cuffs that seal leaks without irritation Â
-
Sized for babies 22–37 lbs Â
Looking for something extra light and soft? Try our Wispy Cloud Diapers. Â
Long‑Lasting Dryness With LiquidLock™ Â
Older babies need more absorbency, and that’s where Alppi Baby’s LiquidLockâ„¢ core makes all the difference. It absorbs 2x faster and locks away 233% more liquid than leading brands, keeping skin dry during naps, playdates, and overnight. Â
Absorption you can count on:
- LiquidLockâ„¢ core for maximum dryness Â
- 2x faster absorption to protect skin Â
- Overnight leak protection that lasts Â
-
Wetness indicator for easy checks Â
Not sure which diapers parents love most? Check out our Staff Picks Collection. Â
Gentle Cloudfreshâ„¢ Comfort for Sensitive Skin Â
Sensitive skin needs breathable, hypoallergenic protection. That’s why Alppi Baby uses Cloudfreshâ„¢ fabric—20% more breathable and 60% thinner than typical diapers—so your baby stays cool, comfy, and rash‑free. Â
Made safe for sensitive skin:
- Cloudfreshâ„¢ fabric for superior airflow Â
- Hypoallergenic and dermatologist‑tested Â
- Totally chlorine‑free (TCF) pulp Â
- Free from dyes, fragrances, latex, parabens, and phthalates Â
Want diapers made with safety as the top priority? Explore our Safety Collection for more gentle, hypoallergenic options. Â
Thoughtful for Parents, Gentle on the Planet Â
Alppi Baby believes what touches your baby’s skin should also be kind to the world they’ll grow up in. From FSC‑certified pulp to eco‑friendly packaging, every detail is designed with care. Â
Eco‑friendly details you’ll love:
- Responsibly sourced, FSC‑certified wood pulp Â
- Individually sealed diapers for hygiene and convenience Â
- Produced in FDA‑registered, CPC‑certified facilities Â
- Packaging made to reduce waste Â
FAQs About Size 4 Diapers Â
What age is a size 4 diaper for? Â
Most babies wear size 4 around 18 months and up. Every child is different, so age is just a guide. Weight and fit are better ways to check. Â
When to move from size 4 to 5 diapers?
If diapers feel snug or leaks happen more often, it’s time to size up. Red marks on the waist or thighs are another clue. Comfort is always the best guide. Â
How many pounds is a size 4 diaper?
Size 4 diapers usually fit 22–37 lbs. Always check the package since ranges vary a little. Fit matters more than the number. Â
Do size 4 diapers hold more pee?
Yes, they’re made to hold more liquid than smaller sizes. That’s important for older babies who pee more and may wear diapers longer. Even so, frequent changes are still best for skin health. Â
Who Size 4 diapers are for
Size 4 is made for 26+ lb and usually lines up with the cruising and walking months. Weight matters more than age, because babies grow at different speeds. Busy toddlers need a diaper that moves with them. When you start thinking about potty training, training pants pull on like underwear.
How many size 4 diapers will you need?
| Pack | Diapers | At 5/day | At 7/day |
|---|---|---|---|
| Weekly bag | 36 | 7 days | 5 days |
| Bundle (2 bags) | 72 | 14 days | 10 days |
| Monthly box | 144 | 28 days | 20 days |
Daily use is a rough guide. Babies who feed often or have frequent dirty diapers will use more, and many parents change more often at night.
How a size 4 diaper should fit
- The waistband sits just below the belly button (or below the umbilical stump for newborns)
- Both tabs land evenly on the landing zone without overlapping
- Leak guards are pulled out all the way around the legs
- You can slide two fingers under the back waist
Signs it's time for a different size
Red marks around the legs or waist, tabs that only just reach, or leaks that keep happening after a fit check usually mean it's time to move up. If the diaper gaps at the legs or the tabs cross over each other, the size may be too big. Smaller: Size 3 (19-30 lb) · Next up: Size 5 (33+ lb)
Size 3 or Size 4?
From 26 lb, Size 4 adds room for active toddlers. If Size 3 tabs barely meet in the middle or you see leaks at night, it's time. Keep a weekly bag of each for the changeover week.
Diapers or training pants?
If your toddler is showing signs of readiness, like staying dry longer or noticing a wet diaper, training pants pull on and off like underwear. Many families use diapers at night and pants during the day.
Why parents choose Alppi
- 3x absorbency with Liquidlockâ„¢, locking moisture in 2x faster
- 60% thinner and 20% more breathable with Cloudfreshâ„¢
- Up to 12-hour protection and advance blowout protection
- Totally Chlorine Free, hypoallergenic, no latex, fragrance or lotion
- Rated 4.6 from 734 reviews
