The Question and Answer section for Mythology is a great resource to ask questions, find answers, and discuss the novel.
Birth was creation. That is how the ancient Greeks understood and processed new life. It stands to reason they the birth motif would be extended to their Gods and the metaphysical.
What specific deed are you referring to?
As far as I remember Gaea was pretty mad at Ouranos for chaining up their children and throwing them into Tartarus or a deep abyss. I'd want to punish him too!