incompetent cervix
previous spontaneous abortions and induced abortions
malformations of the uterus
mazolysis
placenta previa
polycyesis
polyhydramnios
In 50% of cases can not determine the cause of premature birth.
Sometimes administered drugs that prevent the development of labor when the cervix is not yet opened.
If these measures do not give the effect, or disclosure of the cervix is too large, the delivery must take place very carefully, with anesthesia to premature baby as little as possible affected by childbirth. Sometimes, in the interests of the fetus perform caesarean section.