Discuss the possible causes and appropriate treatment methods for hemorrhagic pericardial effusion in a one-year-old child.

A 3.5-year-old baby had no cough with phlegm on the first day and started to have phlegm on the second day, with the cough worsening. Seeking appropriate treatment methods.

Understand the symptoms and treatment methods for an eight-month-old baby’s intestinal mucosal hemorrhage, including antibacterial treatment and intestinal mucosal protection.