Engagement of fetal head is with reference to:
Ans. is a, i.e. Biparietal diameterEngagement is said to occur when the largest transverse diameter of fetal head crosses the pelvic inlet.Largest transverse diameter of fetal head is: Biparietal diameter.
Biparietal diameter
Bitemporal diameter
Occipitofrontal diameter
Suboccipitofrontal diameter
Normal Labour