hey Karina

great Q!

if a baby does not rotate to an anterior or posterior position in labor, their head is unable to negotiate the pelvic cavity and be birthed...this is known as an obstructed labor or a deep transverse arrest. Baby may not engage in the pelvis at all, and this may be due to a true cephalopelvic disproportion, or will start the descent into the pelvis only to become stuck. This can sometimes happen if the baby engages with their head at an angle (asynclitic) or with a hand to their face (compound)

the babies head is too big in the lateral position to fit

in this instance the mother would require a c/s

as Sherie indicated a laternal position of the shoulders increases the risk of shoulder dystocia...and this is why it is so important for the accoucher (whoever is birthing the baby) to have a hands off approach until the shoulders rotate thru the pelvis (restitution)

again if this did happen, and the shoulders where in a lateral position in the pelvis, the midwife would first get the woman to bring her knees to her chest to 'open' the pelvis and with a second midwife applying pressure to the pubic bone to help release the shoulders. If this did not work, the options are limited, and some force will be used to get the baby out and instruments can not be helpful in this instance, its all hands. You may have heard of some babies that are born with a broken collar bone...this is a weak point and allows for the shoulers to be birthed

long answer

xx