I agree with CB, I had three calves on the ground within 5 days and 2 of the calves took right to the udders with no problem from mom, the third mom however would raise her leg up when the calf tried to nurse. I put her in a squeeze chute and milked down the udders once I had my hands on them she reacted the same way to me but after milking them down a bit she stopped raising her leg to the calf and now after two days you can't get that calf off of her mom just stands there content and staring off into space while she nurses. Give it a bit and watch to make sure the calf's bodily functions are working if so if so that's a good sign it's nursing when your not looking. Good Luck to you.