Fetal movement: development and time course.
Prenatal behavior develops in three phases: early rates, acceleration and maintenance, and deceleration to birth. Fetal activity occurs as discrete movements, bursts of activity, and prolonged activity. Four-hour samples were most representative of the daily rates of movement.
D000054:Acceleration; D005260:Female; D005333:Fetus / Q000502:physiology*; D006801:Humans; D008425:Maternal Behavior; D009068:Movement; D011247:Pregnancy; D013997:Time Factors