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,
Eevee X Tamagotchi - Serebii.net
Tamagotchi (1996 Pet) | Tamagotchi Wiki | Fandom
How to Make Your Tamagotchi Grow: 15 Steps (with Pictures)