I got 4 ducks from Metzer Farms - a white layer, 2 buffs, and a Welsh Harlequin. They are 2 weeks old. They are all starting to walk on their feet, the white layer first and worse than the others. The white layer and 1 of the buffs are so much bigger than the other 2, and they are the most pigeon-toed. I am feeding them chick starter from Scratch and Peck. It supposedly has 22.5 mg niacin in it, so I didn't really do much more than sprinkle some Brewer's Yeast on it or in their water every once in a while for the first week and a half. The last few days, I have been upping the Brewer's Yeast and also giving them a liquid B Complex from Walmart that has 20 mg niacin in it. I am not seeing improvements in their legs at all. What am I doing wrong? I mean, they can walk and seem healthy, but they are very pigeon toed.