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Given the following post, respond as if you're commenting on Reddit:
human
[Harry Potter] Before Voldemort gets resurrected in GoF, he's initially a thing that looks like an evil deformed baby. Was that something that was magically created to be an in-between vessel for his spirit, or did he just demonically possess an actual baby?
gpt
Just a magical construct. He explained that in his monologue at the end of Book 4. It's a potion he invented using unicorn blood and Nagini's venom, and it was prepared by Wormtail. It creates a rudimentary body for his shattered soul, but he needs to drink it every day or the body dissolves.