I have a smaller one, she is healthy as a horse, and her attitute makes up for her lack in size. Maddie is 2lbs 8oz at 11 months, but I think that she still may grow a bit, I am hoping that she ends up more like 3-3.5lbs
I agree that there is not much room for error when they are this small. Even an upset tummy is a big deal.
I really hope that your little one gets better, It is so hard when they are sick.