4 рд╕рд╛рд▓ ┬╖рдЕрдиреБрд╡рд╛рдж рдХрд░рдирд╛

Fetal heart soundЁЯТУ detection

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

At 12th week by fetal Doppler

At 20th week by stethoscope