B. Correct.
You can see the head of the baby in A, close to the pelvis; in B, a linear white structure, the femur is seen – this is breech.
Although we have discussed breech and cephalic presentation, the presenting part could be a limb, for example. Usually the baby will turn during pregnancy but some babies will still be in breech position at the time of delivery.
A very few babies will continue to be in a position where the foot is the presenting part – a footling breech.
When the lie of the baby changes a lot during pregnancy the baby is said to be of unstable lie. This can sometimes happen when the mother has had multiple previous pregnancies or when there is a very low lying placenta.
