Why do babies spit up water before feeding?

Patient's question:

Patient Age: 50 days
Detailed Condition and Purpose of Consultation: Multiple instances of spitting up water before feeding (the water is more turbid than water and clearer than milk)

Doctor's answer:

Hello, based on the baby's symptoms, it is likely to be gastroesophageal reflux disease or functional dyspepsia, related to cold exposure or gastric motility disorders. Currently, if vomiting is severe, it is not advisable to eat. Energy and nutrients can be supplemented through intravenous fluids, while Domperidone or Metoclopramide can be taken to relieve vomiting. It should be noted that the above symptoms need to rule out pyloric stenosis, which requires an endoscopy for confirmation.
Lay the child flat on their back. The massage therapist should place the base of the right palm firmly against the abdominal muscles and gently push in the direction of the right upper abdomen—left upper abdomen—right lower abdomen, repeating this motion in the same direction. The technique should not be too forceful, and each session should last about ten minutes, performed 2 to 3 times daily. Wishing the baby good health.