3D and 4D ultrasound are advanced imaging techniques used to visualize fetal anatomy and development in detail. 3D ultrasound creates a three-dimensional image of the fetus, providing clear views of facial features, limbs, and organs. 4D ultrasound adds the element of time, producing real-time video images that show fetal movements and behaviors. These technologies enhance prenatal diagnosis, allowing for more accurate assessment of fetal health and development, and provide parents with a unique bonding experience by seeing their baby in vivid detail.