However, this does not always happen, and premature birth can begin spontaneously, without the manifestation of ordinary symptoms, when a woman carries bags or just went to the toy store. The reason for this is the inability of the uterus to keep the fetus. In this case, the opening of the cervix can begin, regardless of the fights. And if the expectant mother suddenly felt that it became difficult in the vagina, then the fetal bladder began to sink, and the birth would begin immediately.