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Third-trimester scans focus on growth monitoring and fetal well-being. Growth scans compare the baby's measurements against expected growth charts to identify babies that are growing too slowly (intrauterine growth restriction) or too quickly (macrosomia). Doppler ultrasound assesses blood flow through the umbilical cord and fetal blood vessels, providing critical information about placental function. These assessments are particularly important in high-risk pregnancies, including those complicated by hypertension, diabetes, or previous adverse outcomes. Serial scans may be performed at regular intervals to track trends and guide clinical decisions about delivery timing.

3D and 4D ultrasound technology offers additional benefits beyond standard 2D imaging. 3D scans create still three-dimensional images that can reveal facial features, surface details, and spatial relationships between structures more clearly than 2D imaging. 4D ultrasound adds real-time movement, allowing parents to see their baby yawning, stretching, or even smiling. While these scans have significant bonding value for parents, they also have clinical applications, particularly in evaluating facial structures (such as cleft lip), limb abnormalities, and the spine. The ideal window for 3D/4D imaging is between 26 and 32 weeks when the baby has developed enough subcutaneous fat for clear facial features.