Contractions onset, frequency, duration, intensity increase in frequency and duration a uterus can be felt to harden during contraction lasting about 30-45 seconds interval between contractions to be 5 min a Intensity(slight, middle, heavy) the pain of labor is a characterContractions onset, frequency, duration, intensity ◼ increase in frequency and duration ◼ uterus can be felt to harden during contraction ◼ lasting about 30-45 seconds ◼ interval between contractions to be 5 min’ ◼ Intensity (slight, middle, heavy) ◼ the pain of labor is a character