In the recent season finale of House of the Dragon, Rhaenyra was forced to deliver her stillborn child after first learning of the death of her father, King Viserys.
It was an upsetting scene, made even more disturbing by the fact that the princess's daughter (named Visenya in the Fire and Blood novel) appeared to be a malformed human/dragon hybrid.
We only got a brief glimpse of the child in the episode, but Prosthetic Makeup Designer Barrie Gower has now shared a much better look at the design via a silicone baby that was created for the show.
Check out the images below, along with a look at the silicone model Gower worked on for the episode in which Daemon sliced Vaemond's head clean in half ("he can keep his tongue").
It's never really been explained why some Targaryen babies are born with dragon-like features (none have survived, that we know of), but Daenerys and Drogo's stillborn child Rhaego was said to have the same scales, wings and tail.
The prevailing theory is that Targaryen's really do have dragon blood flowing in their veins, and their children look like this while being carried to term. This would explain why only premature births seem to exhibit reptilian appendages.