Fireflies are fabulous. Prefolds are taking a little rest for a while!
The larges fit on the smallest snap setting, not the crossover. Eli is 20#. He's tall and not that fat. He's almost eight months.
They are great because they don't seem to be "soaked" even when they are wet. I am a very frequent changer, but for long outings, it seems they really keep the wet in the diaper and not on the baby, even without a fleece liner.
They gap ever so slightly around the leg opening. Wendy, you'll surely be fine with the smalls. When you come over, you can try the largeon for size.
oxox pam a