I have never raised chickens. I have 5 dutch bantams about 3- 3.5 months old. One is very small and was not growing. After a while, I looked up why this could be. He is a happy chicken, always greeting us when we walk by, energetic and never shuts up. He injured his leg and was separated, but because of his height has not been reintroduced to the flock for fear of pecking. I thought they may have worms. Then, suddenly, this little one sheds a white, long white worm. To my horror, another of the chicks ran by and ate it. (I let them play together with supervision). I did research and found that a store nearby has wazine. I went out and bought some to worm the entire flock. I got home and realized the instructions say "do not feed to underweight animals". I know this is because it is weight based so I tried to look up the dosage per kilogram. I weighed my chicken. He is 63 grams. I don't know what to do. I've heard to add DE to their starter feed, but I don't want to hurt my chicken. I am upset that I didn't know something was wrong since he is so happy all the time. I can do medical dosage conversions, but these chickens came to me by accident and it was either I keep them or they die. I am learning. What do I do?