Even though the show does not mention how the child died, it seems unlikely Mildrith would have killed him. Although some fans have defended the theory, with one saying: "In the show it's never mentioned how the child died, just that he died.

What happened to Uhtred's son?

The unnamed child was the son of Uhtred and Gisela (Peri Baumeister) who died in childbirth at the beginning of season three. The executive producer for the series, Nigel Marchant, took part in a video question and answer session with Radio Times, and the publication addressed the question.

Did Uhtred's son die in season 1?

Uhtred's son dies and it's a devastating turn of events. Uhtred is convinced it's because Iseult saves King Alfred's child, and he in turn lost his own. Mildrith goes off to Odda's (Simon Kunz) estate to live away from the farm and her memories of Uhtred.