The International Foundation for Functional Gastrointestinal Disorders (IFFGD) is a nonprofit organization that provides information and support to adults and children affected by hard-to-diagnose gastrointestinal (GI) disorders. The website has information about GI symptoms and conditions such as irritable bowel syndrome, indigestion, gastroesophageal reflux disease (GERD), incontinence, gas, bloating, belching, heartburn, nausea, and belly pain.

The March of Dimes tries to improve the health of babies by preventing birth defects, premature birth, and early death. March of Dimes supports research, community services, education, and advocacy to save babies' lives. The organization's website has information on premature birth, birth defects, birth defects testing, pregnancy, and prenatal care.

This clearinghouse is a service of the U.S. National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), part of the U.S. National Institutes of Health. The clearinghouse answers questions; develops, reviews, and sends out publications; and coordinates information resources about digestive diseases. Publications produced by the clearinghouse are reviewed carefully for scientific accuracy, content, and readability.

NASPGHAN promotes advances in clinical care, research, and education for infants, children, and teens with digestive disorders. The family resources page of this Web site has information about pain in the belly, diarrhea, constipation, vomiting, poor weight gain, nutritional problems, and diseases of the liver, bowel, and pancreas.