How big can the waxing bird can produce eggs

Waxing birds can have eggs in the second year.Usually breeding in June each year, the birds will build the nest on the branches. The shape is deep cup -shaped, and the inner wall is relatively smooth, usually composed of hair, tender branches, and roots.It can produce 3-4 eggs without noise, the color is blue, with spots on it.It takes about 15 days to hatch for chicks to take off. If artificial breeding, it can be taken out in 10 days.