Just try to find out why baby is crying. Giving nipple in mouth to any newborn will get quite that doesn't mean he is hungry. It's newborn reaction of sucking makes them comfortable but then it becomes a bad habit letter. You should consult your pediatrician for examination of your child to find out the cause. Baby cry for anything,thirst,hunger,gas,flatus wet nappy? Anything it's endless. You as a mother Will have to understand the cry of different things