The most reliable sign of constipation is discomfort with the passage of a bowel movement. Going 3 or more days without a BM can be considered constipation, even though this may cause no pain in some children and even be normal for a few. Large or hard BMs unaccompanied by any of the conditions just described are usually normal variations in BMs.
Some normal people have hard BMs daily without any pain.
Children who eat a lot of food pass extremely large BMs. Babies less than 6 months of age commonly grunt, push, strain, draw up the legs, and become flushed in the face during passage of bowel movements. However, they don't cry. These behaviors are normal and should remind us that it is difficult to have a bowel movement while lying down. Cause Constipation is often due to a diet that does not include enough fiber.