1. What is a 6-month-old baby spitting up milk? 2. What are the reasons why 6-month-old babies spit up milk? 3. How to prevent 6-month-old babies from spitting up milk? 4. What should you pay attention to when a 6-month-old baby spits up milk? 1. What is a 6-month-old baby spitting up milk? 6-month-old babies are a very important period, when they begin to enter the complementary feeding stage. But during this period, many parents will notice that their children will spit up milk. So, what does a 6-month-old baby spit up? In fact, it means that the child spits out the milk he just fed soon after finishing feeding. 2. Reasons why 6-month-old babies spit up milk