Contrary to what others have commented, I had not heard or even thought of this before! Although it may be used sparingly at the moment, this form of transportation of essentials for children needs to develop some momentum. Too often do we hear about the inability to get resources to those that dearly need them. As Usha mentioned below, apparently this is already used for disaster relief efforts - but why do we need to wait for a disaster to occur to use such technologies?
I recently came across this: http://www.waterislife.com/media/videos which provides people without drinking water with filter paper in the form of a book that gives them vital information about the dangers of drinking contaminated water. From what I have found, drones do not seem to be able to carry significant loads at a time. However, with further collaboration among society, ideas such as drone delivery and 'the drinkable book' can come together to further increase the way in which we are able to help those in need.