How long does it take a baby robin to reach adult size?
Baby robins grow fast, reaching the size of their adult parents in a mere two weeks.
Both parents are responsible for feeding their newly hatched brood. The parents regurgitate food that’s partly digested directly into each baby’s mouth for the first four days. At 5 days old, they eat earthworms that their parents break apart. Each day, the babies eat more and more. Soon they’ll graduate to eating whole earthworms. Source: Learner.org