4 ๋…„ ยท๋ฒˆ์—ญํ•˜๋‹ค

Fetal heart sound๐Ÿ’“ detection

For the 1st time by ultrasound
At 6th week of pregnancy๐Ÿคฐ

At 12th week by fetal Doppler

At 20th week by stethoscope