Ultrasound examination does not require special preparation. There is also no need to put the baby to sleep. The ultrasound examination is painless and completely safe for the baby. The doctor covers the top of the baby's head with a small amount of gel. Then, he places a special ultrasound head to the area of ​​the anterior fontanel, through which the ultrasound waves have a chance to reach intracranial structures. The echo image waves are observed on the ultrasound monitor. The test usually takes about 15 minutes.