Had twins born on 2/24, one huge, fat n happy lamb and one small weak one, but otherwise a usual small size. As in, not unnaturally small for what is typical. Weak lamb couldn't get up, tail is very kinked and cannot bend out of that shape, shoulder blades were very loosely attached, front legs couldn't fully straighten out, still can't. Tail didn't move early on, but now wiggles happily. Been helping her up and practice standing and walking, was holding her up to nurse off mom, now she can stay standing on her own to nurse for the most part, but still tires easily. Low muscle tone, but more than at birth. She took her first tiny shuffling steps with her front legs wednesday, then finally was able to get up on her own twice as well. Right shoulder blade is still very loose, she's very unsteady and a bit stiff on the right side. All other lambs are perfectly normal. Ewes have Pipestone loose minerals, separate loose selenium mineral and also separate plain loose salt. They noticeably have a preference to each occasionally. No ewe is obese. No vaccines or drugs given during or right before pregnancy. Pesticide-free pasture hay freely available in winter, out on pesticide-free pasture 24/7, 365 days. Rarely any sheep needs to be dewormed. We do have well-water, maybe its mineral content and such needs to be checked? Selenium and Vit E oral supplement given on 2/26. Fortified Vitamin B Complex injection given today. The right shoulder blade is still floppy. She is 100% on bottle since last night. What might be wrong with it? Anything else I can try? I'll try to get a picture of the loose blade tomorrow.