Three-dimensional (3D) ultrasonography is an advanced imaging technique that captures detailed three-dimensional images of internal structures. In the context of Pediatrics, it is used to visualize the anatomy of fetuses, infants, and young children in a non-invasive manner. This technology enhances traditional two-dimensional (2D) ultrasound by providing more comprehensive views, which can be critical for diagnosing congenital abnormalities and monitoring fetal development.