We bought these 5 pullets at the same place at the same time. The 2 RIR are laying every single day and have been for 6.5 weeks. The others are 2 Plymouth Rock and 1 black sex link or something (looks like RIR w/orange on it). Those 3 have not grown out their combs or wattles yet. 6.5 weeks is a long time to wait. I've read the reasons a chicken won't lay, but these are all together. Same food, water, chicken tractor, environment, etc. THey're quite large, the PRs. Considering making soup if we can't figure this out. Ideas?