Kirkland Signature Diapers (Sizes 3-7)
The Kirkland Signature Diapers (Sizes 3-7) comes in 5 sizes, lists sizes up to 41 lb, and starts with a size for babies up to 28 lb, per Kirkland Signature. Costco's own diaper for sizes 3 to 7, sold in large club packs. Costco lists a blue-when-wet indicator and says it is made without fragrance and elemental chlorine.
- 3 to 7Sizes
- YesWetness line
How the Diapers (Sizes 3-7) stacks up
Against the 43 disposable diapers we track. The shaded band is where the middle half of them fall; the dot is this one.
Within the typical range for disposable diapers (3 to 8).
Within the typical range for disposable diapers (36 lb to 41 lb).
Within the typical range for disposable diapers (10 lb to 28 lb).
What sets the Diapers (Sizes 3-7) apart
Measured against the 43 disposable diapers we compare, from each maker's published specs.
- 11th highest top listed weightof the 42 disposable diapers with it published: 41 lb
- Sizes offered: 5in the middle half of the 42 disposable diapers that publish it (3 to 8)
- Smallest size up to: 28 lbin the middle half of the 42 disposable diapers that publish it (10 lb to 28 lb)
Next to its closest matches
- Pampers SwaddlersNext to it, the Diapers (Sizes 3-7) is 5 fewer sizes; 9 lb lower; 22 lb bigger.
- Pampers Swaddlers 360° Pull-On DiapersNext to it, the Diapers (Sizes 3-7) is 1 more size; 4 lb higher.
- Pampers Swaddlers Ultra Diapers (Day + Night)Next to it, the Diapers (Sizes 3-7) is 4 fewer sizes; 9 lb lower; 18 lb bigger.
Size & weight chart
Weights as the maker lists them, in lb.
| Size | Weight | Shared with next size |
|---|---|---|
| 3 | 16–28 lb | 22–28 lb |
| 4 | 22–37 lb | 27–37 lb |
| 5 | 27 lb and up | – |
| 6 | 35 lb and up | – |
| 7 | 41 lb and up | – |
Listed features
- Wetness indicator turns blue when wet
- Made without fragrance, per Costco
- Large per-size packs
Worth checking
- Club membership needed
Where to buy the Diapers (Sizes 3-7)
Prices and availability change. We may earn a commission from some links.
- Check for recalls: Search the agency's recall list with the model number and date code from the label: CPSC recall search.
Full specs
| Kirkland Signature Diapers (Sizes 3-7) | |
|---|---|
| Type | Disposable diaper |
| Sizes and weights | 3: 16–28 lb; 4: 22–37 lb; 5: 27+ lb; 6: 35+ lb; 7: 41+ lb |
| Wetness indicator | Yes |
| Fragrance-free | Yes, per the maker |
| Chlorine-free | Yes, per the maker |
| Materials | Costco says: ultra-soft breathable outer cover, liner, super absorbent core, stay-put strips, post-consumer recycled inner bags. Made without elemental chlorine |
Compare the Diapers (Sizes 3-7) with
How each closest rival differs from the Diapers (Sizes 3-7), from the makers' specs.
- PampersSwaddlers10 sizesto 50 lb
- 5 more sizes
- 9 lb higher
- 22 lb smaller
- PampersSwaddlers 360° Pull-On Diapers4 sizesto 37 lb
- 1 fewer size
- 4 lb lower
- PampersSwaddlers Ultra Diapers (Day + Night)9 sizesto 50 lb
- 4 more sizes
- 9 lb higher
- 18 lb smaller
- PampersAMORE Diapers8 sizesto 50 lb
- 3 more sizes
- 9 lb higher
- 18 lb smaller
Diapers (Sizes 3-7): questions answered
From Kirkland Signature's published specs, last checked 2026-11-02.
What sizes does the Kirkland Signature Diapers (Sizes 3-7) come in?
3 (16–28 lb), 4 (22–37 lb), 5 (27+ lb), 6 (35+ lb), 7 (41+ lb), per the maker. Makers size diapers by weight, and their ranges overlap. Check the maker's size chart.
Still wondering? Write to us at hello@cribpicks.com and we'll look it up.
More disposable diapers
- PampersBaby-Dry Diapers8 sizesto 50 lb
- PampersCruisers 360° Pull-on Diapers5 sizesto 41 lb
- HuggiesLittle Snugglers8 sizesto 37 lb
- HuggiesPlus Little Snugglers3 sizesto 18 lb
- HuggiesLittle Movers Diapers5 sizesto 41 lb
- HuggiesPlus Little Movers5 sizesto 41 lb
Where these specs come from
- costco.com/f/-/kirkland-signature-diapers
- costco.com/p/-/kirkland-signature-diaper-sizes-3-7/4201002177
Last checked 2026-11-02. Spot something wrong? Tell us. Read our editorial and safety policy and corrections.