Should I Supplement?

I have 8 new kittens that are 6 days old. Everything seems to be going quite well, but the very littlest kitty is a little skinny. I bought a teensy little "pet nurser" and some kitten milk at the store. So I have a couple of questions.

- Should I try and nurse the littlest one or leave well enough alone?
- Would Kitten Glop be appropriate for a baby or is that for just weaning?

Thanks, all - this is a great site.