I have a 5 week old runner duck, that about the age of two weeks old started having trouble standing for any length of time. When he walking, he shakes alot. When he's in the kiddy pool. He still shakes alot, but seems alittle more comfortable. I have been give he vitamins in he water and the local Feed and Seed told me to but poultry antibiotics in the water. He's a sweet little bird. I want to help him if I can. Can someone help with this problem!!!