Runt Bunny

Question
My rabbit (dutch I believe) had 9 bunnies about 2 weeks ago. They are all doing well except for the runt. It seems to be fine, except it is not growing like the others. They are fat and happy, but the runt is exactly that, small and skinny. It has a large head for the rest of it's body size. Like the head has developed the same as the others, but I don't think that it is getting enough food.
My question is: Is there a supplement that I can give it, like with kittens? Or should I let nature take it's course?
This is really bothering me. I appreciate any help or advice.
Thank You,
Bethanie

Answer
There is some information here about handfeeding baby bunnies: http://homepage.mac.com/mattocks/morfz/rabcare.html#baby

KMR Kitten formula and a syringe will work, but you have to have the right amount for the bunny's age.  That information will be listed.

It could also be possible that the bunny has a birth defect, but without having him to a vet it would be hard to tell what it is.

Kim