In the novel Edit
Commander Warren is presumably an older man who supported Gilead's rise to power. For his loyalty, he became a Commander and he and his barren Wife were assigned a Handmaid. It is implied that Warren himself is infertile, and that his Wife and Ofwarren colluded to have Ofwarren sleep with her doctor to conceive and pass the child off as Warren's. It is unknown if Warren was in on this plan or suspected it. Ofwarren successfully conceived and gave birth to a daughter, Angela; unfortunately, the baby was born with defects and only lived for a few weeks.