1. Causes of severe infant spit-up 1.1 Immature digestion 1.2 Improper feeding methods 1.3 Infants overeating or eating too fast 2. How to alleviate severe infant spit-up 2.1 Adopt the correct feeding posture 2.2 Feeding amount and speed 2.3 Give appropriate amount of probiotics III , How to prevent serious infant vomiting 3.1 Choose milk powder or breastfeeding suitable for the baby\’s age 3.2 Avoid overeating and eating too fast 3.3