A fetal doppler uses ultrasound and can pick up fetal heart beat from between 10-12 weeks of pregnancy.
A prenatal listener only amplifies the sound and as a consquence is only good from around 30 weeks of pregnancy.
Don't be fooled by prenatal listeners. Only a fetal doppler will allow you to listen to your unborn baby from as early as 10 weeks.
Orignal From: Fetal Doppler vs Prenatal Listener
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