Multiple Births
When we are faced with a multiple birth, whether identical or fraternal twins, time and mode of delivery is very difficult to predict. Usually the average bear a multiple pregnancy is 35 to 37 weeks, unlike the 40-week gestation of a singleton pregnancy.
The mode of delivery in multiple pregnancy depend on the position in which they are babies in the womb. Most babies as we approach the day of his birth, are positioned upside down, creating a natural birth, but when there are more than one baby, may have different combinations, since one can be in place but the other does not, in this case there will be a cesarean.

In the case of vaginal delivery, the time between the birth of a baby and the other is usually less than an hour. In case the delivery is delayed more, the doctor must make a decision, probably the cesarean section.
At all times, the mother will be connected to a fetal monitor so the doctor can monitor the progress of each baby. In a multiple birth, babies tend to be smaller and this provides the impetus for leaving.
Like any birth, can cause problems with the umbilical cord, the position of the placenta and possible postpartum bleeding.