Esophageal stenosis/atresia
Pyloric stenosis
Intestinal stenosis/atresia
Duodenal atresia
Malrotation ± volvulus
Incarcerated hernia
Meconium ileus/plug
Hirschsprung's disease
Imperforate anus
Enteric duplications
Intracranial bleed/mass
Hydrocephalus
Cerebral edema
Kernicterus
Urinary tract infection
Obstructive uropathy
Renal insufficiency
Viral illness
Acute gastroenteritis
Meningitis
Sepsis
Inborn errors of metabolism
Adrenal insufficiency
Congenital adrenal hyperplasia
Ileus
Gastroesophageal reflux disease
Necrotizing enterocolitis
Milk allergy, FPIES
GI perforation
Pyloric stenosis
Malrotation ± volvulus
Incarcerated hernia
Hirschsprung's disease
Enteric duplications
Intussusception
Foreign body
Bezoar
Meckel diverticulum
Intracranial hemorrhage/mass
Hydrocephalus
Cerebral edema (e.g. in DKA or cancer)
Urinary tract infection
Obstructive uropathy
Renal insufficiency
Viral illness
Acute gastroenteritis
Meningitis
Sepsis
Otitis media
Pneumonia
Pertussis
Hepatitis
Inborn errors of metabolism
Adrenal insufficiency
Renal tubular acidosis
DKA
Ileus
Gastroesophageal reflux disease
Post-tussive
Peritonitis
Drug overdose
Malrotation ± volvulus
Incarcerated hernia
Hirschsprung's disease
Intussusception
Foreign body
Bezoar
Meckel diverticulum
Acquired esophageal stricture
Peptic ulcer disease
SBO, adhesions
Superior mesenteric artery syndrome
Intracranial hemorrhage/mass
Hydrocephalus
Cerebral edema (e.g. in DKA or cancer)
Migraine
Postconcussion syndrome
Urinary tract infection
Obstructive uropathy
Renal insufficiency
Viral illness
Acute gastroenteritis
Meningitis
Sepsis
Otitis media
Pneumonia
Pertussis
Hepatitis
Streptococcal pharyngitis
Inborn errors of metabolism
Adrenal insufficiency
Renal tubular acidosis
DKA
Reye syndrome
Porphyria
Ileus
Gastroesophageal reflux disease
Post-tussive
Peritonitis
Drug overdose
Appendicitis
Pancreatitis
Gastritis
Crohn's disease
Pregnancy
Psychogenic
Cyclic<unk>  syndrome
Nausea and vomiting 
Esophageal stenosis/atresia
Fever and rash
Pyloric stenosis
Abdominal pain 
Intestinal stenosis/atresia
Abdominal pain
Duodenal atresia