Paradoxically, getting a brand new guitar can be the worst thing to do for a child interested in music. A simple used one with scratches and stickers pushes the child's focus to their own skill, not to the object.
Though it isn't true for everyone, I've also noticed that skilled practitioners beat up their high priced tools in ways that doesn't degrade their performance, and they're always able to compensate for inferior situations and build methods of adaptation if they frequently lack the ability to control the situation. For example, a programmer may set up a linux machine that they can always SSH into if they can't control the computer they're working on in order to have a familiar environment or a chef may keep a spatula and a carefully thought out pre-selected set of spices with them to always be able to make something flavourful while traveling.