We have two nearly one week old khaki Campbell ducklings. The female seems to be a little weak in the legs. She walks around and then her legs will start to shake and then she'll squat down. It's like her legs are weak and can't hold her up any longer. She otherwise seems fine. She eats and drinks good and his social. And she does walk around, she just tires out quickly. We feed them Purina Flock Raiser as well as lets them have Kale and bugs from the garden. The male seems fine so I'm not sure what it could be. I took video but can't figure out how to upload it here.