Kelloggs sadly died due to the fact he ate something too big for him and it got stuck in his throat. We couldn't get it out in time.
I realised just before seeing your comment that it IS the crop. It's getting weaker and weaker, it's not able to even stand now. No, it hasn't had grit. We have been making our own crumb,
It's literally putting its head right down, til it's beak is at its feet and falling. It almost seems paralyzed from the neck down
the chick will be two weeks old on Thursday, and the feed we were mixing was oats, sunflower seeds, pumpkin seeds and dried split peas, grinded up.
I think I may have found what it might be: Avian Encephalomyelitis. Very similar symptoms
It could be Avian Encephalomyelitis, you never know, but with the other chick eating something too big and dying and this chick having a large crop, I would lean toward it having an impacted crop and possibly malnutrition.
Do you have any Poultry Nutri-Drench? If you do, give it 1-2 drops each day. Try to get your chick hydrated before you even try to get food into it. You can give the chick water 1 drop at a time dripped at the front of the beak, giving the chick time to take the water in, being careful to keep her upright so she doesn't inhale the water. Massage the crop-how does it feel? If it's hard or full, gently massage it in a downward motion 3-4times a day. Hopefully you can break up what's in there. The mix you gave may have been very hard to digest or may have the chick backed up. While some people do have sand available for their flock, imho, it is always best to just get the right thing (crushed granite) that way there is no question as to whether what is offered is sufficient.
Keep her warm, at 2 wks she probably needs around 80-85F but watch that she does not overheat.
If you are unable to get your chick hydrated, she declines further or she seems to be in pain it would be a kindness to end her suffering.