How long it takes for irregular contractions to become regular is indeterminate and can range from hours to days or even weeks. Irregular contractions are a common manifestation of preterm labor and are often characterized by inconsistency in the frequency of contractions, often occurring at night, can be suppressed by sedation, and fail to dilate the cervix. In addition, irregular contractions can also be seen in physiologic contractions, which are occasional in number per day and do not usually turn into regular contractions. Regular contractions are usually stronger and stronger in nature, and cannot be suppressed by sedatives. Clinically, regular contractions are used as the beginning of the first stage of labor. Pregnant women who experience contractions should seek prompt medical attention to assess the nature and frequency of the contractions, as well as the intrauterine status of the fetus, and follow medical advice.