I have a week old holstien calf that is refusing milk replacer but will drink water. He is very lethargic and lays down alot. When he poops he doesn't get up he just lays there. When I got him on saturday he took his night feeding and drank 2 quarts if milk replacer. He was being warmed by a heat lamp and had thick bedding down. He seemed fine on Saturday. I went out yesterday morning to give him his morning feeding of milk replacer he took some and spit it out then went to lay down under the heat lamp where he started shivering. We decided to warm him up in our house with bedding down in a temporary pen with heaters going and we put a blanket on him. I couldn't get him to eat again until 10pm last night when he ate 1.5 quarts of milk replacer. I went out again today to feed and he still is refusing milk replacer but will drink his water.