Expert answer:
It's possible hear the baby's heart from the 6th week of pregnancy, by ultrasound. If the doctor can not hear the fetal heartbeat, which may happen in some cases, it is a sign that the pregnancy has occurred less than the woman imagines.
In between 12 and 14 weeks of pregnancy, one can hear the baby's heartbeat with a device called sonar Doppler and between the 20th and the 22nd week of gestation, it is possible to listen to the baby's heart with the use of stethoscope Pinard.
