Functional Gastrointestinal Disorders, Breastfeeding, Food allergy, Allergic colitis, Ulcerative colitis, Cold, Acute and persistent diarrhea, Celiac disease, Crohn's disease, Gastroesophageal Reflux Disease, Eosinophilic esophagitis, Cystic Fibrosis Pancreas, Lactose intolerance, Intolerance Fructans, Poor absorption of fructose, Pro-biotics and pre-biotics, Sensitivity to gluten, HIV / AIDS, Irritable bowel syndrome, Intestine Bacterial Overgrowth in Hydrogen breath test