Neonatal hypersalivation can be caused by exuberant secretion of salivary glands, neonatal pneumonia, discharge of amniotic fluid and other factors. 1. Exuberant secretion of salivary glands: when the salivary glands are exuberant in secretion, the amount of saliva secretion is more, and when the newborn’s oral capacity is small and the function of voluntary swallowing is incomplete, the manifestation of excessive salivation can occur. 2. Neonatal pneumonia: the physiological characteristics of neonatal trachea is shorter and narrower, when exhaling, the gas in the lungs through the short and narrow trachea, can be phlegm saliva in the trachea through the respiratory tract flushed out of the oral cavity, and then more saliva occurs. 3. Discharge of amniotic fluid: when the newborn has amniotic fluid in the stomach, the amniotic fluid can be discharged by way of discharging saliva, which can be accompanied by the sound of whirring and grunting, and it is more conducive to discharging it when taking the side-lying position. Newborns with excessive salivation need to consult a doctor in a timely manner, under the guidance of a specialist to actively carry out appropriate treatment, which will help to alleviate the uncomfortable symptoms as soon as possible.