I think they run big, but with use and washing they will shrink a little bit since they are wool, but even so they do still run big.
Babee Greens Wool Longies are interlock merino wool pants for baby. Use these as clothing over a diaper and cover for that extra insurance in case of a leak or edges wicking. Or use it over a diaper as a lightweight diaper cover/clothing combination for extreme comfort. The wool is soft and stretchy 100% merino wool made from Merino Wool knit with Oeko Tex 100 certified yarn. Wash by hand with a proper wool wash, but it doesn't need washing often since it is wool. Handwashing is recommended. Made in USA.
a petite 19 month old in size medium. Underneath it, she is wearing a Blueberry Coverall over a size large Workhorse. These are very comfortable for baby because they are so soft and stretchy and have room in them to properly fit over a cloth diaper. If you have covers that sometimes wick at the bindings, use wool pants or shorts over them stops that issue because wool works so well.
This fits my small 28 months old boy perfectly, except I wish they were slightly longer. I use it for night time as a diaper cover instead of the Disana so that he has his legs covered now that we are in the fall. It would be great if there was one more size.
These longies are the only thing that gets my dream feeding 4.5 month old through the night. All other combinations leave her on a wet bed, and these have been great! I use these longies over a fitted with extra inserts, or a prefold with extra inserts (no PUL necessary!). At 16lbs she is nearing the tail end of use for the size small, but there's still a bit more room left before we size up to medium.