So my week old chick is a very active chick, but when he was only a few days old he would chirp constantly whenever there's no one around. When my second chick hatched five days ago, I put her with him and he stopped chirping, but because the second chick was very weak to begin with, she unfortunately, didn't make it past the fifth day. Ever since I took her out of the broader, my older chick has been chirping a lot but quietly and would often just sit down (my second chick would go under him for warmth and he would plop down with her) even though he's usually very energetic. He also stopped getting excited to see me like he normally does and stopped wanting to do things he usually liked to do. My other eggs have shown no signs of hatching yet so it's just him in the brooder. I don't know what to do to cheer him up.