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Hydration helps in a 3D/4D ultrasound by increasing the amount of amniotic fluid around the fetus. This fluid acts as a cushion and provides a clear medium for the ultrasound waves to travel through, allowing for clearer and more detailed images of the fetus. When a woman is dehydrated, the amount of amniotic fluid decreases, which can lead to less clear and less detailed images. Therefore, it is recommended that a woman stay well hydrated before having a 3D/4D ultrasound.