The whole world in the backyard

Maya, I didn't answer your question because I just found your post in the spam folder. It sounds like the chooks aren't getting anough high protein food. They should be laying well at 18 months of age, although very cold or very hot weather will put them off the lay as will them getting new feathers. Give them some porridge made with milk or bread soaked in milk, some meat scraps or cooked brown