What is wrong with a newborn spitting up mucus-like white milk-like substance?

Patient's question:

My child has been born for twenty-three days. I always feel that she has a sore throat. Sometimes, she spits out a sticky, white, milk-like substance similar to phlegm, but she doesn't cough. When she falls asleep, she always struggles hard, and it looks like she's in extreme pain. What is wrong with her?

Doctor's answer:

Regarding the physiological characteristics of infant respiratory corpses and autoimmune features, the trachea and urethra of infants are shorter and narrower than those of adults, with rich blood vessels, delicate mucosa, poor ciliary activity, and weak ability to completely clear respiratory secretions. Additionally, their immune function has not yet improved, making them prone to recurring snoring in the throat. Treatment options include inhalation therapy with atomization or pediatric acupuncture.

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