The same thing happened to me. My Tamagotchi was a baby at 0, then a child at 0, then a Tennegaer at 1, then a Tarakotchi at 2. It's not a glitch, it's normal. Anything can happen to your Tamagotchi. In 2005, my Tamagotchi V1 was 3 and it turned into a Kuchipatchi :) (one of my favorites!)...