I have 6 Isa Browns and 5 EE's. They are all approximately 17-18 weeks old. One of the Isa Browns layed her first egg last Friday!! We've gotten one egg every morning since....I'm assuming all from her. Yesterday's egg was the size of my large eggs I get from the store!! Today the egg I got was much smaller, closer to the size of the first egg, which makes me wonder if it was from a different chicken. But since the one hen just started laying I wouldn't be surprised if the egg size is not consistent yet. So do chickens in a flock normally start laying around the same time, or is it different with every hen? And is it normal for eggs to differ in size from day to day? I'm so excited that we're finally getting eggs!!