A four-month-old baby lifts both hands up at the same time while lying flat, and puts them down at the same time.

Patient's question:

Sure, I can help with that. Please provide the content you want to be translated into English.

Doctor's answer:

When lying prone, the baby's upper body is fully lifted, perpendicular to the bed; the legs can raise and kick off clothes, bedding, and toys hung up; the vision is flexible, able to shift from one object to another; they begin to babble and respond to adults' teasing with sounds; they enjoy eating complementary foods.

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