How long does it take a baby robin to reach adult size?

How long does it take a baby robin to reach adult size?[su_ad]
-Six months
-Two weeks
-One year
-Eight weeks
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Two weeks

Baby robins grow fast, reaching the size of their adult parents in a mere two weeks.
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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