The Start

Harry finds his three mates in Remus Lupin, Severus Snape and Sirius Black. He defeats Voldemort withing the year but something goes wrong and Tom turns back to a baby, the same thing happened to Albus Dumbledore. With him being essentially defeated, the mark is gone and the prophecy fulfilled, Tom Riddle takes Voldemort's place. With the quad as parents what can go wrong?