Thank you both very much. They are all very similar (black with white paws) and it's a bit difficult to distinguish them, actually nearly impossible :-)
Some are slightly smaller, I think I'll try a little supplement on them.
She is a rescued cat and I am not sure about her history. She came when the kittens where about week old, she was very skinny but quickly gained a bit of weight, quite young herself and now she has a beautiful shiny coat and is very relaxed. She eats like two cats...
What's the earliest I can...
I am looking after a cat with 9 kittens. They are about 2-3 weeks old. They are all well, with some conjunctivitis under control (so far), treated with Chloramphenical and washing. The kittens are growing and I am worried about the mother ability to feed them all as they are getting bigger...