Final answer:
The most favorable fetal position for birth is the vertex presentation. This position is associated with the greatest ease of vaginal birth.
Step-by-step explanation:
The most favorable fetal position for birth is the vertex presentation. In this position, the fetus is head down and the smallest part of the head exits the birth canal first.
This position is associated with the greatest ease of vaginal birth.
On the other hand, the transverse lie, frank breech presentation, and posterior position of the head are less favorable for birth and may require Caesarian section for delivery.