Whether it is normal for a newborn to sleep for 4-5 hours in a row needs to be analyzed on a case-by-case basis. If the child wakes up without any abnormality, it is normal. If it is accompanied by crying, vomiting or fever, it may be caused by illness. 1. If the newborn sleeps continuously for 4-5 hours, but after waking up, feeding, playing, etc. are not affected, and the mental state is good, then it is a normal phenomenon, do not worry too much, and wake up to eat milk. 2. If the newborn sleeps for 4-5 hours, wakes up crying, poor appetite, lack of spirit, crying, or vomiting, fever, diarrhea and other symptoms, may be suffering from upper respiratory tract infection, gastrointestinal infection, intracranial infection and other diseases. There may be other reasons why a newborn baby sleeps for 4-5 hours in a row. If there are other symptoms associated with it, it is recommended to go to the hospital in time for a complete examination to clarify the cause of the disease and then give targeted treatment or therapy. All of the above medications should be used under the guidance of a doctor.