I am new to chickens, and have 4 leghorns, and 3 red chickens that I got when they were all day or so old chicks. The leghorns have really blossomed into football size birds in 7 weeks. They are funny to watch, come to the pen sides to eat treats and are usually the first to come out of the coup when I walk near it and call for them. Great birds, and can't wait to start getting the large white eggs I am "promised" by this breed.