| Allergic |
| Food protein-induced proctocolitis |
| Food protein-induced enteropathy |
| Eosinophilic gastroenteropathies |
| Anaphylaxis |
| Nonallergic |
| Infectious |
| Sepsis |
| Viral gastroenteritis |
| Bacterial enteritis (Salmonella, Shigella, Campylobacter, Yersinia) |
| Parasites |
| Gastrointestinal disorders |
| Hirschsprung disease |
| Intussusception |
| Volvulus |
| Gastroesophageal reflux disease |
| Pyloric stenosis |
| Other |
| Metabolic disorders |
| Neurologic disorders |
| Heart defects |
| Necrotizing enterocolitis |
