1. Reasons for newborn babies to spit up milk. It is a very common phenomenon for newborn babies to spit up milk. The reasons include underdeveloped digestion, overfeeding, swallowing air, etc. In addition, there is another condition called gastroesophageal reflux disease, which requires prompt medical treatment. 2. How to prevent newborn babies from spitting up. Methods to prevent newborn babies from spitting up include: feeding amount and frequency, maintaining correct feeding posture, avoiding excessive stimulation and touching, etc. At the same time, pay attention to the baby\’s posture and expression, and adjust the feeding method in time. 3. What should you do when your newborn baby spits up milk? When your baby spits up milk, you should first