Final answer:
The fetal heartbeats can be heard by a Doppler as early as 10 weeks gestation.
Step-by-step explanation:
The fetal heartbeats can be heard by a Doppler as early as 10 weeks gestation. At this stage, the heart has already formed and is beginning to function. The normal parameter for fetal heart tones is 110 -160. The normal parameter for fetal heart tones is between 110 to 160 beats per minute, and these tones can be detected using a Doppler ultrasound device. Fetal heart tones can be detected as early as 8 weeks gestation. During this time, the fetus undergoes crucial development, with the heart beginning to beat regularly. As gestation progresses, detailed anatomical features develop and the fetus reaches significant milestones, such as the differentiation of sex organs by the end of the 12th week and the beginning of the ability to hear around 24 weeks of gestation. Overall, the capacity to detect a regular heartbeat marks an important step in verifying the health and development of the fetus.