Actually, pinkies and other very young rodents seem to be more resistant to CO2, I don't know why, they just don't seem to succumb quickly. But anything with eyes open seem to go down pretty easily. I don't know if it's because they're more active and use up oxygen quicker or what? It's just what I've observed.
If their eyes aren't open and they don't have much fur yet, put them in a ziplock and stick them in the freezer. 30 grams is pretty good size for only 2 weeks old.
About another week and some of them may have their eyes open. You don't want to freeze one without gassing it first if it has a decent amount of fur, death would be too slow. But then again gassing the really young ones isn't really effective. Three weeks can be kind of a grey area. My personal preference is to gas the ones that have their eyes open and just freeze anything younger then that.
Do NOT use the freezer if they have any fur! Once they get fur, freezing is extremely inhumane and takes a long time. I've used CO2 on babies as young as 9 days, and they went down as quickly as the adults do.
A positive attitude may not solve all your problems, but it will annoy enough people to make it worth the effort. ~ Herm Albright
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