If the kids are lseeping when you get into the shed, wake them up and watch for "the stretch". If they do stretch and are relaxed all is fine. If the get up and immediately rush to mum to try and feed - problems...
PS.: Not sure hat you mean be "Elvis" legs, but it will probably sort itself out in a few days. Kids (and lambs) are often born with slightly contracted tendons in the foot making the walk etc on their knuckles rather than the bottom of the foot. Lots of exercise usually the best for it.