At the end of a pregnancy, a lot is going on. The baby might be descending and moving into place, and the pregnant body is changing every day. It’s the baby’s time to arrive and it’s going to happen, one way or another. But what is a due date? India speaks to Holly Dunsworth, a biological anthropologist who’s challenging the obstetrical dilemma. Exploring the idea of why the due dates exist, India looks at the inaccuracies of how they are measured whilst questioning - how does labour begin? Midwife and author Leah Hazard provides insights into what we do know, and the possible influence of full moons. Presented by India Rakusen. Producer: Lucy Hunt. Series Producer: Ellie Sans. Executive Producer: Suzy Grant. Commissioning Editor Rhian Roberts. Original music composed and performed by The Big Moon. Mix and Mastering by Olga Reed. A Listen production for Radio 4 and BBC Sounds.