Did you know fetal heart rate naturally changes as a baby grows? ❤️ A typical fetal heart rate ranges from 120 to 160 beats per minute during the second and third trimesters, and variations within this range are expected. These shifts can reflect fetal movement, maternal activity and gestational age. Take a look at the chart to see how heart rate patterns evolve across each trimester. You can also visit our Fetal Cardiology page to learn how clinicians use this information to guide assessment an