I have three chicks who are about a week old. One is an Ameraucana chick and I noticed that she has been acting very lethargic since yesterday. When I bought them, she seemed like she was the largest of the three, but now, the other two are heavier than her, and have a lot more feathers starting to grow. In the pic you can see she's kind of sitting back on her legs, she's also been trying to walk like that, she can't seem to stand up straight for more than a few seconds. I dropper fed her some sugar water a little while ago, but haven't seen any big changes yet.
She's in a Rubbermaid bin with the other two chicks, with a heat lamp, food and water.
She's also keeping her eyes closed a lot, even when trying to walk, loses balance quite easily, and is much less fiesty than the other two.
Any advice is appreciated.