The juvenile phase in fancy pigeons begins around four weeks of age, when the squab is fully feathered and approaching the size of an adult bird. Growth rates vary significantly among fancy breeds, with larger varieties such as Runts and Kings taking longer to reach full size than smaller breeds like Tumblers or Oriental Frills. Regardless of breed, this period is marked by rapid skeletal development, muscle building, and the gradual refinement of breed-specific physical traits.
During weeks four through eight, young pigeons undergo dramatic changes in body proportion. The head-to-body ratio shifts as the skull reaches its mature dimensions, and the beak hardens and takes on its adult shape and color. In wattle-bearing breeds, the cere and eye cere begin to develop, though they will not reach full expression until the bird is well into its first year. Leg length stabilizes, and feathered-leg breeds show increasing density in their foot and shank plumage.
The juvenile molt, which typically begins between eight and twelve weeks of age, is one of the most significant developmental events of this stage. The soft, often dull-colored baby plumage is gradually replaced by the first set of adult feathers, revealing the bird's true color, pattern, and feather quality. For breeders and exhibitors, this molt provides the first real opportunity to assess a young bird's potential against the breed standard.
Weight should continue to increase steadily through the juvenile period, though the rate of gain slows compared to the explosive growth of the first few weeks. Regular weighing helps breeders track progress and identify birds that may be struggling. A young pigeon that plateaus or loses weight during this phase may be dealing with parasites, nutritional deficiency, or the stress of social integration into a larger flock.