how long will hummingbird baby ready to fly
1 After about two weeks, they start to look more like small adult hummingbirds. 2  By then, they have grown real feathers and their beaks (depending on the species) are often longer. 3  After three weeks, the young birds are ready to leave the nest forever.his is a relatively long time for a bird incubation. When the baby hummingbird is still in its egg, they have strong neck muscles and a hook on their short bill in order to peck their way out. Hummingbird babies are born blind and naked without feathers.