Hi All! I'm new here, and can't seem to find an answer to this anywhere- does anyone know how many grams a chick should gain daily? I realize there are many types of chicks, so is there a place I can look to find growth charts by breed? I'm asking because I have 3 week old chicks, two that were bred from a Barred Rock Roo and a Black Sex-Link, and one bread from that same Roo and a very old (6-7 years) Red Sex-Link. The two from the Black sex-link are growing fine, but the other one is nearly 1/3 their size (we call her LG, and pretend like we know she is a girl). About 3 days ago she started cheeping very loudly and did so any time she wasn't asleep. Yesterday around lunchtime, I decided to take her to the vet, I just knew something wasn't right. The vet examined her and asked how she eats/drinks and I told her that I had never actually seen her eat and that I had been giving her water from a dropper for several days because it seemed that she hadn't figured out how to drink from the water trough like the others. The vet told me that she is just skin and bones and that she probably has never eaten! I felt terrible, she was cheeping because she was literally starving to death! The vet gave me a feeding tube and showed me how to crop tube-feed and instructed me to feed her a mixture of blended up chick starter and water. She gave me no guarantees, but said this is all she could think for me to do, as the bird is teeny (probably the size that she hatched out at), and that the only way to see if she has any internal deformities would be x-rays/surgery. I got her home and put her in her own box to monitor her bowel movements, the vet said her little vent was so tiny, that maybe she couldn't even use the bathroom. I did the first feeding, felt her crop fill, and watched her poop about 30-45 minutes later. I was so relieved to see that at least her "pipes" are working. I was up until 1 last night feeding and watching her, I put her back in with the others and went to sleep. This morning, she woke up around 8 cheeping loudly, so I started her hourly feeding again. She is feisty and constantly "bullies" the other chicks so she must be feeling a little better. I just weighed her after 24 hours from her last "weigh-in" and ensured she had an empty crop, and she has gained 1 gram (27g now, she was 26g yesterday at the vet). So that long story brings me back to my question, how do I know if she is gaining enough weight? I don't wanted to underfill her crop, but I feel like overfilling it could be more harmful. I would love it if I could find a resource or talk to someone who is familiar with chick weight and weight gain. I love this little chicken and she comes right to me when I approach her brooder, so I know she understands I'm helping her even though she hates the tube and fights me (note- I am super careful inserting the tube, it's a urinary catheter, I go slowly and never force it so that I don't harm her). She has also started laying down to sleep like the other chicks do, and she had always slept standing up before the tube feeding. If anyone has any advice on weight/weight gain or any other advice that will help me save this little chick, I would be eternally thankful!!