I have two Rhode Island Reds and one Barred Rock. They are all about seven months old. The two Reds started laying about a month ago but the Barred Rock has yet to give even the hint of an egg. We were surprised because she is the biggest of the three. Another strange thing is that while the combs on the other two girls have grown quite a bit, the Barred Rock's comb is still tiny. We are first time chicken owners so any thoughts would be greatly appreciated!