My son is 4 years old. His problem is irregular bowel habits. From almost one month now his bowel movements happens once in 3-4 days. We have included a lot of fiber-rich food, like fruits, leafy vegetables, it remains the same. When the movements occur, the stool comes out is very hard and painful. We have consulted a doctor and have been prescribed Duphalac Lactulose Solution 5 ml every day. This medicine was given for almost 2 weeks but had no success. Please advise us what steps we have to take to make his bowel movements regular and routine.