Thanks for the question. I have been seeing children with this problem repeatedly. This is quite common as children eat small amounts of fruits and vegetables and to top it their water intake is also less. You can ask your doctor to add liquid paraffin in suspension for (this is available in India by the name cremaffin). twice for three days (this will lubricate intestine and passage of stools will be easy) and then lactulose twice after meals(this will cause softening of stools). With this his food habits need change which included lots of vegetables, salads, fruit, fresh fruit juices with pulp, lots of liquids. If he prefers junk food then allow it only twice or thrice a week that too with salads and fruits. Avoid refined starches all together. This will lead to better bowel habits. Vaseline may be applied at the anus so that passage of stool is easy.