If a newborn baby does not eat milk and sleep on the first day, there are several reasons for this. First, it is a physiological phenomenon, although the child does not eat milk and sleep, but in a good state of mind after waking up, there is no crying and restlessness, the child will appear to be significantly better after eating milk, which is a physiological phenomenon, parents do not need to worry too much. Second, due to bacterial infection, more common is sepsis, neonatal pathological jaundice. The reason why the child does not eat milk and sleep is mainly caused by a serious bacterial infection in the body. Often there are symptoms such as not eating and not moving, or even generalized jaundice. If there is a bacterial infection in the blood culture, the child should be given anti-infection treatment in a timely manner, otherwise it can cause serious complications such as sepsis and septic meningitis in children.