The baby contains a nipple on the following common causes: 1, early manifestations of respiratory infections, often accompanied by pharyngeal congestion, given antiviral treatment, such as ribavirin spray can be improved; 2, gastroesophageal reflux, reflux of gastric juices to stimulate the pharynx, resulting in the phenomenon of dry heaving, you can go to the hospital for ultrasound of the abdomen to make it clear; 3, around the irritating air, such as the emergence of reflexive dry heaving; 4, the air is dry easy to appear dry heaving, you can apply humidifiers in the home, it will be significantly improved.