3 of my 4 welsummers (about 20 weeks old) that are now not wanting to walk.
They’ve been on Purina layer pellets for close to a month now before that flock raiser crumbles.
I agree, with adding poultry vitamins that contain B2 and taking a close look at the legs/feet is a good idea.
It's hard to tell, but looking at the photos, it looks like the toenails/feet may be damaged/injured. Also look between the toes is that red/inflamed(?) What do the bottom of the feet look like? One more thing, the photo I've circled, the beak-is it off, have a lesion or was that just food?