A newborn baby spitting up blood streaks at 5 days old - what could be the cause?

Patient's question:

After drinking milk, blood streaks in the mouth 5/6

Doctor's answer:

Hello, considering bronchitis, which is characterized by cough, phlegm, sometimes wheezing, and fever, anti-inflammatory drugs can be used for symptomatic treatment. At the same time, taking Compound Fresh Bamboo Liquid can be effective for treatment. Drinking more warm water and paying attention to warmth are beneficial for symptom improvement.
Your baby's diarrhea discomfort is likely caused by indigestion. It is recommended to take infant Jianpi San to strengthen the spleen and aid digestion, and avoid overeating.
It is recommended to take Smecta and Bifidus Enzyme for treatment and see how it goes.