Sex-links type of chicken, usually start around 16/19 weeks. Combs are red and swollen. About 1 to 2 weeks before they lay, they will squat when you put your hand over their back. GCI have 12 week old ISA Browns. Their combs have started turning more red over the past few days. Does this mean they're going to start laying soon, or is it still a month or 2? I've heard if they start laying too early it can be bad for their long term health. I've given them fermented feed right from the start.