Here is an example from real life.

A compassionate 6-year-old girl was in the first grade and had just learned reading and writing. She decided to write a heartwarming story about a hippo boy who had no friends. He had only one eye and was ignored by the other hippos. But one day he met a hippo girl with only one ear. They fell in love, got married, and had a hippo baby... with no nose. And they all lived happily ever after.

That 6-year-old girl grew up to become a compassionate loving wife and mother, who is a successful professional writer.

The child and the adult are actually the same person.
The child is the father [or mother] of the man [or woman].

I am very proud of her, my daughter.