I have to ask: Did it hatch under it's mum, or in an incubator? The only reason I can think of that causes curled feet is if a baby is helped out of it's shell (either the mom pecked the shell away, which they will do sometimes, or it was struggling and required human intervention to hatch). The only cure for that is to egg wrap them in a slightly damp washcloth and let them "Hatch" out of the washcloth. The action of pushing out of the egg (or washcloth) helps build the muscles and get them standing up.
But I don't know if that is the reason the baby isn't standing.