Newborns who vomit yellowish-green water at birth are mainly considered to be related to neonatal hypopharyngeal syndrome, in which the vomit is mostly amniotic fluid contaminated by meconium. Neonatal hypopharyngeal syndrome is a common disease in newborns. If the fetus swallows too much amniotic fluid or amniotic fluid contaminated by meconium during delivery, it can stimulate the gastric mucous membrane of the newborn after birth, leading to hypersecretion of gastric acid and mucus and causing vomiting, and the yellowish-greenish color of the vomit is mostly the amniotic fluid contaminated by meconium. If the newborn vomits, you should consult your physician for treatment to avoid aspiration of the vomit into the trachea, causing aspiration pneumonia or asphyxia. Newborns vomiting yellowish-green water, there may also be other reasons, it is recommended to go to the hospital in a timely manner to improve the examination to determine the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.