With it being almost 4 weeks old, I would think it would be a little more developed than your picture shows. Are you sure it’s eating? I ask this because I had a Wyandotte that was about like your chick in the picture development and age wise. I thought she was a failure to thrive chick. I had always seen her eating with the other chicks and she even seemed to eat longer than they did. Her poops looked normal and I don’t see any reason why she was behind the others. But she wasn’t growing much and peeped all the time. I finally brought her upstairs and put her on the dining room table on some towels and tried to get her to eat some hard boiled egg I had made her, which she didn’t even attempt to eat. I did get her to take a little Nutri-Drench from a dropper but not much. She was peeping a lot, like she had been doing since I got her. I assumed she was hungry, so I just poured some of her dry chick starter on the towel. She immediately started pecking at it and then I noticed something. She was picking it up and it was just falling out of her beak. I never noticed this because she was below me in the brooder eating and now was about eye level to me on the table. I watched her do this for about 5 minutes and I don’t think she got much if anything down. Her beak looked normal so I thought maybe she was having issues swallowing the food. So I took some and put it in a coffee grinder I had and made it into a powder. I gave her that and boy did she eat. She was actually getting it down because the powder I made was disappearing. I ground her up some more and she must have spent 20 minutes eating. Her crop was huge after she was done and I then decided to just grind all the chick starter until she was older. I I immediately noticed a big surge in her growth and her constant peeping stopped. Fast forward to today and she is 14 weeks old and my largest Gold Laced Wyandotte of the three I got. She now eats the unground starter fine, she was 8 weeks old before I was comfortable not grinding it smaller. This might not be the case for your chick, but I see so many people on here with the same problem and accept it’s just a failure to thrive situation and nothing can be done. In my case she just couldn’t or wouldn’t swallow the chick starter the way it came out of the bag. I would definitely check her crop to make sure she is getting food in there after eating and also make sure it’s emptying as well. You can also try Nutri-Drench to get some extra vitamins in her or boiled egg for extra protein if she will eat it. I hope everything works out and she catches up with the other chicks, just keep working with her and don’t give up on her yet.
