When can the fetal heart rate typically be heard by a Doppler device?

The fetal heart rate can typically be detected by a Doppler device between 8 and 12 weeks of gestation. At this stage, the development of the fetus allows for the heart's activity to be strong enough to be picked up by the Doppler ultrasound. The Doppler device is designed to amplify the sound of the heartbeat, making it audible to the healthcare provider and, in many cases, to the expectant parents as well.

Prior to 8 weeks, the fetus is still very small and the heart is not developed enough for consistent detection by Doppler, which is why earlier options would not be accurate. Detection after 12 weeks is also feasible, but the earliest reliable detection happens within the 8 to 12-week window, as this aligns with the overall development and size of the fetus at that point in pregnancy.