I made a Tamagotchi Pix Growth Chart! based on the information I could find on Tamagotchi Wiki. This isn't a complete growth chart, we don't know all of the adult characters yet,
Original Tamagotchi review: Rebooting a '90s classic the right way
User blog:XXKayaXX/Yasashii Growth Chart | Tamagotchi Wiki | Fandom
Tamagotchi Connection Version 2 | Tamagotchi Wiki | Fandom
Eliot's Tamagotchis — Tamagotchi x Sanrio m!x available g1 characters...
Welcome to Gotchi Garden! ❀: Tamagotchi v1 (English) & Tamagotchi Plus (Japanese) - Growth Chart