Jet-like spitting up in infants may be related to improper feeding, congenital pyloric hypertrophy, purulent meningitis and other causes. 1. Improper feeding: If the infant is fed too much milk, it can cause a large amount of spitting up, which can be jet-like, when the amount of milk in the stomach cannot be stored. 2. Congenital pyloric hypertrophy: it often occurs 2 to 3 weeks after birth, with progressive projectile vomiting, occurring 10 to 30 minutes after each feeding. 3. Purulent meningitis: purulent bacterial infection of the meninges and spinal membranes, caused by intracranial infectious inflammatory reaction, headache, projectile vomiting and other symptoms can occur. Infant jet-like vomiting, there may be other reasons, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.