Avoid IV fluids before doing a trial of oral rehydration therapy in uncomplicated cases of mild to moderate dehydration in children.
Probiotics have NOT been shown to provide any benefit
Acute gastroenteritis 
Esophageal stenosis/atresia
Bacterial gastroenteritis
Pyloric stenosis
Viral gastroenteritis
Intestinal stenosis/atresia
Acute diarrhea
Duodenal atresia