Fetal echocardiography is a procedure similar to a pregnancy ultrasound, which through an ultrasound evaluates and detect possible changes in the baby's heart. It is usually performed between 18 and 24 weeks gestation and can be performed in the abdomen (abdominal ultrasound) or through the vagina (transvaginal ultrasound). The reasons why this method is performed may be different and can be distinguished: the blood flow, heart rate structures or baby. Through fetal ultrasound you can see a more detailed image of the heart baby in a normal pregnancy ultrasound. Some heart defects such as small holes in the heart or mild valve problems can not be detected, despite its high accuracy.