It may be normal for a newborn to sleep for five or six hours without eating if there are no other abnormalities. The presence of abnormal manifestations, such as waking up crying, poor mental state, etc., indicating abnormal. Newborns who sleep for five or six hours in a row without eating may be normal and do not need special treatment if they only appear occasionally and there are no other abnormalities. Newborns who sleep for five or six hours without eating, but there are other effects, such as waking up crying or poor mental state, vomiting, diarrhea, fever, etc., there may be an abnormal situation, such as colds, pneumonia, gastrointestinal lesions, and so on. If a newborn baby sleeps for five or six hours without eating, and there are abnormal manifestations, it is recommended to bring the baby to the doctor as soon as possible for examination and treatment to avoid delaying the condition.