This document outlines 8 dangerous signs in newborns that require immediate medical attention: inability to drink or breastfeed, lethargy or unconsciousness, convulsions, grunting with every breath, severe chest indrawing, vomiting everything, cyanosis, and prolonged capillary refill time. The causes of these signs include conditions like CNS infections, hypoglycemia, hypocalcemia, acute gastroenteritis with severe dehydration, intestinal obstruction, and sepsis. Newborns exhibiting any of these signs should be evaluated promptly by a medical professional.