Digitama

DigiTama (デジタマ) are the source of all Digimon. (Dub: DigiEgg)

All Digimon are born from DigiTama, which can be produced in three ways. DigiTama can spawn randomly in the Digital World from random data. They can be a Digimon reincarnated from death. Sometimes a Jogress Evolution of two Digimon will result in them being reborn as a combined DigiTama with the potential to grow stronger than their previous forms. DigiTama come in a variety of sizes, shapes, and colors. They typically hatch into Baby I Digimon, but will sometimes hatch directly into Child Digimon, or even Adult Digimon in the case of Numemon.

(Note: "DigiTama" is a portmanteau of the words "Digital" and "Tamago" (卵), egg in Japanese, hence it is literally translated as "Digital Egg or DigiEgg")

DigiTama -> Baby I -> Baby II -> Child -> Adult -> Perfect -> Ultimate