User blog comment:Miskos3/Fairy Tail 526: My Name Is..., Review/@comment-24053170-20170313234946/@comment-7418318-20170314064718

He did seem to have a fully developed mind from the beginning, so that would help greatly. It would probably also speed up how fast he can learn to crawl and walk and once he can at least crawl he can start to live off of fruits and vegetables.

That still leaves it unlikely for him to survive, but we've seen stuff even more ridiculous in this manga...

As for the clothes, considering how he stole food the most obvious answer would be that he stole the clothes too. Or he might have bought them. He could have gotten the money for them from stealing, begging or working odd jobs or maybe entertaining people with his magical talents... or singing, dancing and juggling for all we know.

Or he could have been doing the same as Mavis is doing right now: Walking around naked while casting an illusion of clothes around his body.