Consider basic labs
Consider abdominal ultrasound and/or CT
Consider UA
Consider and, if necessary, rule out other more concerning diagnoses first
Pediatric<unk> is typically a clinical diagnosis
Constipation 
Constipation
Dysuria
Hirschsprung's disease
Dysphagia
Congenital anorectal malformations
Hiccups
Imperforate anus