Ok so I have a muscovy that is 6 weeks old. The only problem is she still looks like she is 2 weeks old. She is just now starting to get tail feathers in and only has 4 or 5. He brother is tripling her in size right now and is almost fully feathered. I did some research and It said they can have health issues and internal organ problems. Should i take her to a vet? She seems fine and i have not had any problems at all with her. Not sure why she is not growing. Can anyone help me?