Final answer:
A regular heartbeat in a fetus can be detected around 6 weeks of gestation. By around 10-12 weeks gestation, the heartbeat can usually be heard using a stethoscope or handheld Doppler device.
Step-by-step explanation:
A regular heartbeat in a fetus can be detected around 6 weeks of gestation. This is when the fetal heart begins to form and function, and the heart tones can be heard using a Doppler device or ultrasound.
During pregnancy, the fetal heart develops and becomes stronger, and by the time the pregnancy reaches around 10-12 weeks gestation, the heartbeat can usually be heard using a stethoscope or a handheld Doppler device.
It's important to note that the timing of when fetal heart tones can be heard may vary slightly from person to person and can depend on factors such as the position of the fetus, the equipment being used, and the expertise of the healthcare provider.