Solve the following equation. 
Definitions:
Post-Natal Stage
The period following childbirth, focusing on the mother's recovery and the baby's adaptation to life outside the womb.
Embryonic
Referring to an early developmental stage in animals and plants; in humans, it covers the first eight weeks after fertilization.
Foetal
Pertaining to a fetus, the developmental stage of a vertebrate occurring in the womb before birth.
Post-Natal
Pertaining to the period immediately following birth.
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