It is the new trend of obstetric medicine. Unlike in three dimensional or 3D ultrasounds, the 4 d adding color and movement to the image. Why are called Sonograms in real time. Anne, of 32 years, just do an ultrasound 4 d in Madrid clinic Eres and speaks well about their experience: it seems impressive. You see a little person with their hands, arms and feet, rampant at ease by the maternal uterus. Private clinics are in luck. This new technology lures hundreds of parents who want to find out how is the face of your baby until it is born. And advertising attracts them with slogans of the type look at me MOM or with questions like are you ready to have an amazing experience? or with examples: is as if you were watching his son on TV. It is true that now we are going to save in the future photos of the newborn, why not begin directly from the womb?. Years ago that ultrasounds are routine in all gynecological exams for pregnant women. Standard ultrasonography provides the image in two dimensions of the fetus. Through them, the doctor can assess the baby’s development, determining gestational age and detect anomalies. Conventional ultrasound uses high frequency sound waves to produce images of organs and tissues. Multi-dimensional ultrasound 3D also uses ultrasound, but allows you to display images with volume of the fetus. Now, the 4 d ultrasound adds movement and color. It’s an image in real time where the factions of the baby are much more accurate and realistic. He is not a movie, but a sweep of ultrasonic waves which collide with the corporeal structures and reflect them doing a kind of ECHO: hence, the ultrasound designation. This echo is analyzed and converted into images by processors. The impatience to see the face of the future baby is crowding the private centers where these 4 d ultrasounds are carried out.