Newborns without stool for a day may be a normal phenomenon, or it may be due to functional constipation or gastrointestinal dysfunction. 1. Normal phenomenon: it may be due to the newborn’s low intake, not formed enough fecal mass, if the newborn’s stool is normal in nature, it is usually a normal phenomenon, no need for special treatment, do not need to worry too much. 2. functional constipation: newborns do not have stool for a day, may be due to intestinal flora disorders, induced by functional constipation, often manifested as dry stools. 3. Gastrointestinal dysfunction: newborns with low levels of normal intestinal flora, gastrointestinal function is prone to abnormal changes, due to environmental and dietary factors, gastrointestinal dysfunction can occur, which may be manifested in the newborn’s lack of bowel movement for a day. If the newborn has no bowel movement for a day, it is recommended to closely observe the situation, and consult a doctor for symptomatic treatment as prescribed by the doctor if there is any abnormality.