Hi, my son just got his first batch of chicks 3 weeks ago. They are 5 weeks old now. 2 australorps, 2 Sussex, 2 Plymouth Rocks. They are all doing great, running around, getting feathered, growing: except one of the sussex has only grown about half as big as the others. She is eating, but mostly now she sleeps all day. She looks cold, but she doesn't want to stay close to the heat lamp (she has plenty of space to move away from it, so maybe she's just miserable. Is there anything I can do for her? (I am not paying for a vet). She does not appear to get picked on by the others.
The hatchery vaccinates all for coccidia, plus I had them vaccinated for Mareks and the two other vaccines which I don't remember the names of right now.
I am feeding them chick starter. I added a container of grit today, but none of the chicks have bothered with the grit.
Should I add eggs, or electrolytes ? Do they actually help in this case. How do I tell if her crop is ok?