Hello, My niece's daughter has been experiencing projectile vomiting. They have switched formulas several times and the projectile vomiting continues. Her birth weight was 8 lbs 11 ozs, current weight as of 2 weeks ago is 12 lbs 10 ozs. She will be 5 months old 4/28/13. At present they are treating her for reflux, and have been for a couple months. Any ideas, my thoughts are pyloric stenosis or food allergy, any thoughts?