Why can't Hera have kids?

Could you please elaborate on the reasons why Hera, as a character or entity in a particular context, is unable to have children? Are there any mythological, biological, or other factors at play that prevent her from giving birth? Is this limitation a unique aspect of her story, or is it a common theme among certain deities or figures in similar narratives? Understanding the motivations and constraints behind Hera's inability to reproduce could provide valuable insights into the cultural and religious beliefs that influenced her creation.