I would say Home planet. But only because i've never seen it happen to any of mine. it would be cool. but i guess im to late because ive out grown tamagotchis already. ubt I still like talking about them so yea. I wouldnt want it to go back to a baby because then i'de have to start all over. I would never would be able to play with it if it froze. And Batteries are rare for them. My tamagotchi would have died way to many times. its owould be nothing new