A bit of blood from the umbilical cord of a newborn baby may be caused by secondary infection, poor growth of the umbilical cord, bleeding disorders and other factors. 1. Secondary infection: If the umbilical cord of a newborn does not fall off after 1 week and is accompanied by bleeding symptoms, it may be due to viral and bacterial infections that cause inflammatory lesions of the umbilical cord. 2. Poor growth of umbilical cord: The poor growth of umbilical cord may lead to friction of clothes, thus causing bleeding. Under the guidance of the doctor, use iodine povidone to sterilize the umbilical cord stump, and then use sterile gauze to cover the bandage to avoid clothing friction on the umbilical cord. 3. Hemorrhagic disease: If the newborn baby has a vitamin K deficiency or a systemic infection that causes coagulation disorders after birth, the umbilical cord may not fall for a long time, accompanied by symptoms of bleeding. It is recommended to consult the neonatology department in a timely manner, under the guidance of the doctor to identify the cause of the disease and then carry out symptomatic treatment.