It is a myth that if you touch a baby bird its parents will reject it.

Birds have a very limited sense of smell and will continue to feed a baby bird that is placed back in its nest by a human. If you cannot reach the nest, you can place the baby bird in a woven basket and hang it securely on a nearby branch. Be sure to prop the bird up a bit with leaves or grass so that the parents can reach it. Parents will continue to feed their baby if given the chance. Many baby birds learn to fly from the ground up. A fully feathered baby bird is considered a fledgling and many parent birds continue to care for their young after they jump out of the nest. You may not see the parent but they will be close by. It is important to keep pets indoors during this period.