Sorry, I had another thing to add. Make sure he is eating enough fruits and vegetables, but cut out the fruit juice completely.
Welcome to the gastroenterology community! We have had parents come on the forum with the same concern as you. My advice is always that if it is not bothering your son and he is not getting constipated, then you shouldn't worry about it and you should not subject him to stool softeners. This is not dangerous or bad, it is just something that some people deal with.