Hmm... I see this thread has been sleeping for a week. I'll try to revive it. I, too, have a tiny Nando. Her name is Micra. She's a smooth-feathered blue sizzle, and is 12 weeks old. Her sister, a smooth-feathered blue sizzle, by comparison, is normal size. Micra has not grown, in size, since the day she was hatched. Only her wings have grown. She has a little trouble eating large pieces of grain so I keep her on powdered grains. She is otherwise normal and is very smart. Due to her siblings maturing, and mama weaning them, I had to transfer her recently to another broody hen, who took her in with her own day-old peep. The day-old peep has outgrown her at one week, but she doesn't seem to mind. She keeps eating, staying small, and sleeping under the new mama.
Any chance that her organs will grow larger, even though her skeleton doesn't, and she will die of the pressure on her heart as it tries to pump blood to the other growing organs, at some point?
Can she grow big some day, like Nando? Hope so.
(pics of her and her sibling coming tomorrow).