A fetal doppler is a type of ultrasound device that is used to detect fetal heartbeat via sound waves. As a necessary part of routine prenatal care, midwives or healthcare providers may use fetal dopplers at the end of the first trimester of pregnancy. Currently, with the emergence of small and handheld fetal dopplers, more and more fetal dopplers have already been sold over the counter for home use. And at-home fetal dopplers have been appealing to more and more parents-to-be. Understandably, when parents can monitor their baby’s heartbeat from time to time, they feel more reassured.