How often should you feed slings?

[Dragoon]

I have different care sheets now, and got info. from everyday to twice a week.
I've been doing 2 or 3 times a week, they all get offered something, the tiny slings and the bigger ones. They're all pretty fat, except for the Usumbara. I give that one two at a time, but it stays slim. (Oh well, it just molted too...)

Everyday?? That would just bite...

D.