Female blackbirds will lay 3-5 eggs that will then hatch after 13-14 days. Young chicks will then leave the nest after 13-14 days after they have hatched. If the nest is disturbed, young chicks can leave and survive as early as 9 days after hatching.
Male birds will help young fledged birds while the female blackbirds will prepare for the next nesting. There is typically only a 30-40% chance that nesting will produce fledged young within this species of bird.