There is no normal frequency of bowel movements, according to WebMD. Most doctors use average frequencies to gauge healthy bowel function, which means that the "normal" range could be several times a day or a few times a week.
Normal is relative when it comes to bowel movements, so there is only cause for concern when a person experiences more or less than his usual pattern, notes WebMD.
A slowdown in bowel movements can be caused by a variety of factors, says Everyday Health. These factors include dieting, certain medications, a lack of physical exercise or pregnancy. Lifestyle changes may help, such as eating more fiber, drinking more water and moving more. If these things fail to produce results, it is important to consult with a doctor to rule out possible underlying conditions.