What are the reasons for a two-day-old baby to have a bowel movement?

Patient's question:

Infant checked for brain hemorrhage after two days of fasting

Doctor's answer:

Clinical manifestations can only provide some diagnostic clues. Cerebrospinal fluid examination, if it shows uniform bloody fluid and reveals, is helpful for diagnosis. However, many highly skilled doctors cannot rule out the disease even with normal tests. This procedure should not be performed when the patient's condition is critically ill. Imaging studies are helpful for definitive diagnosis. CT and ultrasound scans can indicate the site and extent of bleeding, which is helpful for judging the prognosis.