Disclaimer: I am completely new to raising chickens. I have 6 hens, all different breeds, the youngest being about 24weeks old and the oldest about 28weeks. Two of them started laying about a month or so ago (one of them being one of the oldest and the other in the middle somewhere) but none of the rest are laying yet. Is this normal? Also, of the two that have started laying, one of them has stopped and hasn't laid in about 2 weeks now, after being a once-a-day layer for at least a few weeks. I'm just wondering if something is wrong, or if this or normal? TIA!