Level 2 1: 1. What are four-dimensional baby photos? Four-dimensional baby photos are an advanced fetal ultrasound technology that can display the fetus\’s facial features, body structure and activities in a clearer and more realistic way. Compared with traditional two-dimensional ultrasound examinations, four-dimensional baby photos can provide more three-dimensional and realistic images, allowing parents to better understand the appearance and status of their unborn children. Level 2: What are the advantages of 2D and 4D baby photos? Compared with traditional two-dimensional ultrasound examination, four-dimensional baby photos have the following significant advantages: