I had a 3-4 month old chick who suddenly started staggering and eventually got to a point where she could not stand at all, unassisted. Her legs would splay (complete splits) either side to side or front to back. Not being sure of the cause, I tried EVERYTHING. Lots of vitamin B (hard boiled eggs, Vit B supplements, VetRx, NutriDrench, using surgical tape to tape her legs 3-4" apart. I separated her from the flock because they picked on her horribly. She came inside at night and was out in a pen on the lawn during the day. Then the left leg started supporting her without tape, but the right dragged and folded back (like with a back injury on a dog). I bought a tiny dog sandal (wide and flat) to help the right foot be more solid. It took 6 weeks of forcing liquid vitamins into her mouth, pushing her to eat, taping her legs, buying her sandals but finally, bit by bit, she started standing up with BOTH legs! She's still a bit wobbly, but she's back in the flock and able to walk and run. Still not ready to perch, but I'm hoping she'll get there!