Purpose: The aim of this prospective study was to evaluate the relation between bowel functions and anorectal manometric assessment scores by comparing these 2 parameters with increasing patient age. Methods: A total of 13 patients whose anorectal malformations had been repaired were evaluated at least 2 to 4 times yearly between 1997 and 2003. Bowel functions were assessed according to a scoring system. The maximum bowel function score (BFS) was 14 points. Anal canal resting and squeeze pressures, rectoanal inhibitory reflex, and sense of defecation and urgency were determined manometrically, each corresponding to 1 point when present. The maximum manometric score (MS) was 5 points. The patients with constipation were treated with laxatives or enemas, the other patients who had soiling due to a short colon were treated with loperamide hydrochloride and one patient who had a failed operation was treated with a redo procedure. Results: After the particular treatment for each patient, both BFS and MS were raised, in general. The MS of patients increased significantly with the advancement of therapy, but reached a plateau and showed no progression thereafter, BFS, on the other hand, continued to increase with rising patient age. While the 2 scores were correlated at the initiation of therapy, they were not correlated with progression of therapy, with BFS surpassing MS. When the MS of the patients with a BFS under 7 points was compared with that of others over 7 points, no significant difference was found. Conclusion: Both BFS and MS increased after treatment, but they did not change with increasing patient age. Good bowel functions were not associated with good anorectal functions.