What is the 'normal' position of the baby for delivery?
In the great majority of cases the baby lies with its head down and the buttocks up. This is called a cephalic [head] presentation, and is the most likely to lead to a normal vaginal delivery. In this cephalic presentation there are various variations too:
In the vertex positions further you can have 2 variations:
The most common as well as the most favourable for a normal delivery is the LOA [Left Occipito Anterior position]
A breech presentation is said to occur when your baby lies 'upside down' ie; the head of the baby is upwards and the buttocks are downwards. If this is your first pregnancy you will usually be asked to undergo a planned caesarian section. If this is your second or third pregnancy with a previous vaginal delivery you may be allowed to try for a normal delivery.
If you have a transverse lie your baby is lying across your stomach with the head on one side and the buttocks on the other. Neither the head nor the buttocks are over the birth canal and it is impossible for you to have a normal delivery
Is when the head is down but the neck of the baby is extended and again the diameter of the head becomes too large to allow a normal delivery
If your babies umbilical cord overlies the mouth of the uterus this is called a cord presentation and is extremely dangerous as when your bag of waters ruptures the cord comes out first and prevents the baby from getting its oxygen supply from your uterus.
Occipito posterior positions
This is when your baby is head down [as a normal 'cephalic' presentation] but the back of the head [occiput] is towards your back instead of towards your front as it should be. This means that the nose of your baby is pointing forwards instead of backwards as it should be. This is seen in about 30% of patients and may lead to longer and more painful labours with a higher chance of a caesarian section.