Healthcare providers determine engagement by performing a physical examination. They assess the position of the babyâs head relative to the pelvis. This is often referred to as the "station" of the babyâs head. A âzero stationâ means the head is at the level of the ischial spines of the pelvis, indicating full engagement. Above this level, the head is not yet engaged, and below this level, the head is further descending into the pelvis.