One rabbit kit smaller than the others

by Alison
(UK)

My dwarf lop had 7 babies 10 days ago. One died after a day but all the others were fine. Now though, one is nearly half the size of the biggest kit. She seems in proportion and does not have a sunken tummy but her movements aren't as energetic as the others.

I guess she must be getting milk to have lived this long but I'm worried that as the others get stronger she will get left behind even more so at feeding time. Should I start offering her milk myself or just leave the doe to it?