Certainly consider allergies, as the other moms mentioned. Another possibility is reflux, or GERD. GERD can occur when the muscle that is supposed to close off the stomach from the upper tract is weak, so some stomach acid can leak upwards. This condition can be diagnosed through an endoscopic exam, where the doctor would look for signs of irritation in your child's esophagus.
My son has reflux- he is successfully treated with Zantac, a liquid medicine that reduces the acidity of the stomach fluid. It is also helpful to keep him upright or at least only slightly reclined for a while after eating. He is doing great- hope all is better for your little one.
at 9:55 PM on Jul. 19, 2008