Baby robins also have fruit incorporated into their diet thanks to their parents. Adult robins will peck at strawberries, grapes, blueberries and blackberries and take substantial amounts of the fruits back to the young in the nest. Other fruits may also be fed to them, as well as seed and any other food that is left out by humans for the birds.
After the birds have been nursed properly by the adult robins, which is relatively quickly given the rate at which they develop, they will soon be ready to venture out of the nest. The birds will only usually stay in their nest for around two weeks or so, between 14 and 16 days, and after this they will be ready to venture out into the world properly themselves. From here, the robins will shadow their young babies as they start the process of learning how to fly and feed themselves.
People often think that birds only eat worms, but like all animals on earth it's necessary that the birds get a balanced and healthy diet of insects, nuts, and fruits. Without this nutritious diversity the birds simply would not survive.