The descent stages of the baby are named as -3, -2, -1, 0,
+1, +2, +3 according to the alignment of the leading edge of the head. These
numbers define the level of the head. This level is determined by manual
examination from time to time during birth. When the head reaches +2, there is
little time left for birth. At the level of +3, the doctor or midwife will give
birth to the baby by making the necessary maneuvers and making an episiotomy
cut if necessary.
The baby's descending from the birth canal and opening of the
cervix usually happens simultaneously. First, there is no downfall and then no
opening in the cervix, but sometimes there is a partial opening in the cervix,
and then the baby begins to descend in the canal. For example, while the baby
is standing at the highest level in the birth canal, the cervix may open a few
centimeters, and the baby then begins to come down. Meanwhile, the opening
continues.
The baby's
head does not go down from the birth canal:
If the baby never goes down the birth canal or has partially
descended and paused at that level despite the opening of the cervix and hours
have passed, there may be a so-called "pelvic incompatibility"
condition. In other words, the birth channel of the mother may not be able to
give birth to that baby in the normal way. In this case, since the birth is
stopped halfway, a caesarean section is mandatory.