The fetus is active and responsive. Fetal mobility occurs early, but the mother's perception of fetal movement (quickening) does not occur until 16 to 20 weeks in first-time mothers, and 14 to 16 weeks in later pregnancies. Fetal behavior is influenced by its state of sleep or alertness. The actual number of daily movements is variable between fetuses; thus it is important for the mother to establish what is normal for her baby before any problems arise. Box 1 provides a guideline to the stages of fetal movement. Figure 1 is a Sample Fetal Movement Record a woman might use to track her fetus' movements.