This slim volume is not a typical Asterix book; rather than being a comic strip album, it is an illustrated short story with the usual division of labour between Goscinny and Uderzo. Originally published in Pilote, the story tells how Obelix came to fall into the cauldron of magic potion and become the permanent bearer of super-human strength we know so well. Asterix himself narrates.
People who know the Asterix canon will be thinking, six years old? Surely Obelix was a baby when that happened? Well, I can't explain the contradiction and I'm not going to worry about it too much. I suggest other readers do the same and instead focus on the witty story and the delightful full page and double page illustrations.
This is essential for all true Asterix fans.