Aspiration pneumonia is a symptom of early respiratory distress in newborns. If the fetus inhales a large amount of amniotic fluid in utero or during delivery, it is called amniotic fluid aspiration pneumonia; if it inhales amniotic fluid contaminated with meconium, it is called meconium aspiration pneumonia; after birth, it is called lactation aspiration pneumonia when a large amount of milk is inhaled into the lungs. 1, amniotic fluid aspiration pneumonia: generally refers to the amniotic fluid is not contaminated, clinical severity and the amount of amniotic fluid inhalation related. Most have a history of asphyxia, shortness of breath or dyspnea with cyanosis and moaning after resuscitation or birth, and the general signs and symptoms last longer than 72 hours. When the amount of amniotic fluid inhaled is small, shortness of breath or no symptoms are present. When the amount of inhaled amniotic fluid is large, dyspnea is obvious, and fluid or foam may flow from the mouth. 2. Meconium aspiration pneumonia: It is the most common form of aspiration pneumonia that occurs before or during labor and delivery, as more amniotic fluid mixed with meconium is inhaled in utero or during labor. It is common in term or premature infants, with a history of intrauterine distress and postnatal asphyxia, and amniotic fluid fecal staining. The disease is often severe, with dyspnea, moaning, cyanosis, and trismus signs shortly after birth. The lungs are covered with dry and wet rales, which can cause respiratory failure, pulmonary atelectasis, emphysema, pulmonary hypertension and central nervous system manifestations of hypoxic-ischemic encephalopathy. Once complicated by pneumothorax and mediastinal emphysema, the condition changes abruptly or even death. 3, lactation aspiration pneumonia: there is often choking and coughing from breastfeeding, milk flow from the mouth and nose, accompanied by shortness of breath, cyanosis, etc., which can lead to asphyxia in severe cases. In case of secondary infection of the lungs, it is similar to bacterial pneumonia. The severity is related to the amount and number of inhalations.