Diarrhea
Nausea/vomiting
Abdominal pain
Fever, viral symptoms (myalgias, URI symptoms)
Acute gastroenteritis 
Esophageal stenosis/atresia
Bacterial gastroenteritis
Pyloric stenosis
Viral gastroenteritis
Intestinal stenosis/atresia
Acute diarrhea
Duodenal atresia