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A bird's wing, like the wing of an aeroplane wing, is curved from front to back in a shape scientists call an aerofoil. As the bird's wing flaps, air flows faster over the upward-curved top than it does across the bottom. Fast moving air has less pressure than slow moving air, so there is more pressure pushing up on the wing than there is pushing down, creating what scientists call lift. Lift is what gets a bird ( or an aeroplane) into the air, and helps keep it there. A babdy bird leaving its nest for the first time knows instinctively how to flap its wings. But it takes time for a young bird to become good at flying. It needs time to practice and to make its muscles strong.
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