We have a a one week old bottle baby Randall heifer. She was extremely hypothermic when we found her and we put her in warm bath, brought up her temp. She had 3 pints of colostrum first 24 hours. We are keeping her in stall with lamp at night, dry bedding. She appears to be super healthy running and jumping eating well, now up to 1 quart high quality milk replacer 4x a day. Today she has started trembling in back end while drinking from bottle but doesn't seem to be trembling any other time. Any idea what's happening I will call vet also tomorrow