Comparison Trial of Enema vs. PEG 3350 for Constipation

Inclusion Criteria: * Constipated children who have one of the following three conditions: * Fecal impaction (lower quadrant mass or dilated rectum with hard stool), * Functional fecal retention (large diameter stools as determined by caregiver \<twice/week and retentive behaviors, or * Excessive stool in colon on abdominal radiograph as determined by attending radiologist or treating physician Exclusion Criteria: * Ill appearing patients (signs of acute surgical abdomen, abnormal vital signs, or overall ill appearing as determined by treating physician) * Patients whose evaluation in the ED includes more than plain radiographs or urinalysis * Patients who receive analgesia for the abdominal pain in the ED (except acetaminophen or ibuprofen) * Non-English speaking patients and families * Patients with milk allergy * Patients with molasses allergy * Patients who are pregnant * Patients with a chronic medical conditions which may be associated with constipation (including patients with cystic fibrosis, cerebral palsy, hypothyroidism, spinal anomalies, and known gastrointestinal anatomic abnormalities) or a history of prior abdominal or rectal surgery * Patients who are admitted to an in-patient unit