well I have my first calf today, and we have 10 inches of snow on the ground and it's supposed to be cold tonight, it's 13 deg now. The cow is very protective and down a big hill from my barn. Do I leave them alone or try to move the calf ?She has him dry but he seems to be shivering alot and he doesn't appear to be nursing. his legs are covered with snow but he seems to be moving good do I need to worry about ears or feet for frost bite?