1. Reasons why babies spit up milk It is a very common phenomenon for babies to spit up milk, but there are many reasons for spitting up milk, such as overfeeding, eating too fast, imperfect digestion, etc. At the same time, it is also possible that the baby has gastroesophageal reflux symptoms and needs timely medical treatment. 2. How to prevent your baby from spitting up milk 1. Feeding amount and frequency: Follow the principle of \”feeding on demand\” to avoid overfeeding. 2. Adjust the feeding posture: Make the baby\’s head slightly higher to promote smooth passage of food through the gastrointestinal tract. 3. Pay attention to the eating speed: let the baby eat slowly and stay quiet while eating.