1. What does a two-month-old baby spit up? 1.1 Definition of spit-up Spitting up means that the baby regurgitates the food in the stomach and squirts or flows out of the mouth after eating. Symptoms usually include vomiting, hiccups, and coughing. 1.2 Reasons why a two-month-old baby spits up milk There may be many reasons why a two-month-old baby spits up milk, including incomplete digestion, eating too much or too fast, incorrect posture, etc. 2. How to prevent vomiting in a two-month-old baby? 2.1 The amount and speed of food intake during feeding should be paid attention to the amount and speed of food intake during feeding, and try to allow the baby to eat slowly to avoid over-saturation and eating too quickly.