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Debby Ryan and Josh Dun have welcomed their first child together ... and, it appears they opted for a home birth.

The actress shared a post to social media ... revealing their daughter, Felix , was born hours after the "supermoon" -- which happened on December 4. Instagram/@debbyryan

In Debby's post, she shared a video of herself leaning over the side of an inflatable pool ... Josh comforting her -- so, it seems she didn't got to the hospital for this ordeal.

The rest of the pics showcase their little girl -- who she writes is just eight pounds -- mostly sleeping after the exhuasting ordeal of being born. Instagram / @debbyryan

Ryan writes in her caption that Felix was born right into her father's hands around midday ... before waxing

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