It's my first loss and I am new to chickens, it makes me sad. I was hand watering the chick and I am pretty sure it didnt' eat anything. I was checking last night for pasty butt and noticed its belly button area was really crusty and there was a small part of the umbilical cord there, like very small part, and it was really hard and it just didn't look right. So I checked some of my other chicks and they did not have that..... could that be what killed it? Or it just up and died? It didn't die in shipping but died within the same day as I received the shipment - should I call the hatchery?