What should I do if my 2-month-old baby spits up milk very badly? A 2-month-old baby who vomits very badly should be aware of the presence of congenital hypertrophic pyloric stenosis. Most of this disease occurs when babies start vomiting about 2 weeks after birth, and vomiting mostly occurs about 30-40 minutes after eating. Some babies may vomit in the form of jets when vomiting is intense, vomiting out all or most of the milk they eat, and some may even spurt it out of their nose. Most of the vomit is stomach contents, white milk or yogurt-like milk clots, and in severe cases, the baby may vomit stomach contents that contain coffee-like or dark red color. After vomiting, the baby usually has a strong feeling of hunger and a relatively strong appetite, but vomiting often occurs again after eating. It is important to emphasize that if the baby vomits frequently for a long time, it may cause dehydration, malnutrition, electrolyte disorders and pneumonia. Therefore, parents should bring their babies to the hospital as soon as possible and complete relevant examinations such as abdominal ultrasound under the guidance of the doctor to clarify the diagnosis. If it is not congenital hypertrophic pyloric stenosis, the doctor may also request an upper gastrointestinal imaging test if necessary to exclude vomiting caused by gastroesophageal reflux, hiatal hernia, gastric torsion, etc. Parents should calm the baby and try to cooperate with the doctor to complete the tests successfully. If congenital hypertrophic pyloric stenosis is diagnosed, surgery should be performed as soon as possible.