Merries vs Moony Diaper Sizes in Japan: Current Tape & Pants Weight Ranges
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Japan / Baby & Kids / Baby Care
Merries vs Moony Diaper Sizes in Japan: Current Tape & Pants Weight Ranges
Merries and Moony use familiar letters — but their current ranges are not identical.
This comparison uses current official Japan weight charts, not marketplace seller tables.
Brand chart first, letter second
Merries pants M currently covers 6–12kg. Moony has more than one M-stage pants option, including 5–10kg and 6–12kg ranges depending on the product / developmental style.
Current pants M guideline.
One current low-stimulation pants M range.
Current standing-stage MoonyMan M range.
Japanese diaper letters are not fully standardized across brands. Always use the exact brand and product chart.
Merries and Moony overlap — but not perfectly
Both brands use S, M, L and Big-type naming, but Moony's current pants lineup also separates some M products by developmental stage such as rolling/crawling and standing.
| Brand | Format / size | Current guide |
|---|---|---|
| Merries | Pants S | 4–8kg |
| Merries | Pants M | 6–12kg |
| Merries | Pants L | 9–14kg |
| MoonyMan | Pants S | 4–8kg |
| MoonyMan | Pants M (rolling–crawling) | 5–10kg |
| MoonyMan | Pants M (standing) | 6–12kg |
| MoonyMan | Pants L | 9–14kg |
Why this matters when buying from Japan
An overseas marketplace may translate every pack simply as “M.” The Japan manufacturer pages can tell you whether that M is really the same stage you expected.
Real fit depends on waist, thighs, movement and your baby's body shape.
Official sources
Kao Merries
Official lineup
Unicharm Moony
Official current M-size guide
Bottom line
Use the Japanese brand's current weight chart every time. A familiar S/M/L label is only a shortcut, not the full specification.
