What are the precautions for a four-dimensional color ultrasound?

Patient's question:

I am almost 7 months pregnant, and my stomach has become noticeably larger recently. The baby is also moving frequently inside. Now I am a bit limited in movement and usually stay at home. I want to go to the hospital for a 4D ultrasound to check if the baby is healthy. Some people say that there are some preparations needed for the ultrasound.
What kind of help do I need: What are the precautions for a 4D ultrasound?

Doctor's answer:

Hello, before the 4D color Doppler ultrasound examination, there are some items that expectant mothers need to pay attention to:

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