I have 3 chickens who are at 23 weeks. I am getting 2 eggs a day (occasionally 1) now but I don't know which are laying. I have 2 Delaware and a RIR. The eggs are different shades of brown one is fairly brown with a little redish tint, the other much more of a coffee with a lot of milk color. By appearances and actions (squatting) it seems the 2 layers would be the Delawares but I'm not sure if they'd be laying such different colored eggs. They were bought from the same batch at the local feed store but are unlikely from the same hen/cock, their coloration and size are somewhat different. So, now I'm wondering if maybe the RIR is laying along with only one of the Delawares. Also, how long does it take for the eggs to reach "full size?" These still seem like "pullet eggs" weighing between 1.5 and 1.8 oz in shell. (small to medium sized) ETA: They've been laying for about 3 weeks now.