Contracted tendons in hind legs

I just had a calf born last night and he stands on his ankles on his back legs. Fronts are already straightening out, but he's just standing on his ankles in the back. Should I splint them somehow? I've never done it and am not sure how to go about it. Worried they won't fix themselves if he's just standing on them wrong almost all of the time. What should I do?:

You can try to splint them. Give the calf 5cc of bo-se once a week for 2 to 3 weeks