Answer :

“Twinkle in the Eye”.
Zygote.
Blastocyst.
Embryo.
Fetus.
Newborn (Neonate).
Infant.
Child.
Toddler.
Youngster.
Pre-teen.
Teen.
Adolescent.
Young Adult.
Adult.
Senior.
Corpse.

If you need the descriptions, or explanations of what’s going on before, after and between each stage, let me now.