Chickens change the most during the first year of life. They start out as adorable little fluff balls requiring constant care and monitoring. Within just 5 weeks they are ready to make the transition to "outside" (the coop that will become their full-time home) and a fairly self-sufficient life.
At 3-6 weeks old, they become mangy and diseased-looking as their fuzzy covering begins to shed and is slowly replaced with mature feathers. Their wattles and combs grow and turn a deeper red. Cockerels (young roosters) make their first attempt at crowing. At 20-25 weeks old, pullets (young hens) lay their first eggs, which will be small and weak-shelled. Over time they will lay more frequently, the eggs will become larger and the shells harder. By 6 months, the pecking order, which governs who gets to pick on who, will be established and combs and wattles will be fully formed. What a busy six months this will be!