I posted over a month ago about one of my (now) 3-month-old polish/silkie mix chicks. She's been a little weaker than the other two since the beginning, but in December I noticed she was having difficulty standing, walking, and roosting. There doesn't seem to be anything wrong with her legs except that they're weak. Until 3 weeks ago, the chicks were living in a dog kennel on my kitchen table; when polyvisol didn't help, I started putting pink "rooster booster" from the feed store in their water. It's vitamin B12 and K. That in (I think) combination with letting them run around outside during the day while I was at home made her improve enormously. She was still a little unsteady, and often used her wings to help her balance when running, but I never saw her stagger or her legs tremble. 3 weeks ago I put the chicks outside, in the now-weather-proofed kennel, so they could adjust and meet the older hens. Since then, though I've kept putting the B12 in the water, I don't know if she's getting as much as before, since the chicks often follow the 'big hens' to their water instead of drinking in their kennel. She has been a lot more sedentary the past three days, sometimes stumbling and falling. It's very windy here in the spring, which makes it harder for her to walk, and I worry that she's not eating and drinking as much as she should for that reason. She tends to move in short bursts, about 6 yards, and then sits down. Plus her brother, the new yard rooster, is going crazy trying to guard her and the other hens at different ends of the yard. It's hard to hear her crying when the other chickens are on the other side of my garden wall. Today I gave her about 1/4 tablespoon of the booster in a syringe (though she didn't swallow it all). I'm wondering, should I do this every day until she improves? Is there another vitamin deficiency I should be looking out for? Can she overdose? What symptoms of overdose should I be on the lookout for? If I start dosing the water of all of the chickens, could it hurt the ones that don't need it? If anyone has any advice, or experience with this kind of leg issue, I would love to hear it.