This is called Chronic Constipation, from what i have been told it's not the diet of your child, to much milk, cheese whateverhave you. my daughter has been on Miralx for 8 years, she is 11. She had the same problem. It is a good medication, you will need to work with it though, all kids are differant and it works more on some not enough for others. So if she gets diarreah don't give her a capful cut it back to 3/4 capful and so on. If she goes through a period where she isn't going you will have to do a "clean out" and double up for 2 days or so. My daughter was so bad in the beginning she wouldn't go for weeks at a time. I had to take her to the hospital and they told me she was being poisoned by her own body, her poop. If you notice "skid marks" in her diaper, or "crumbs" that is a indication she is getting backed up and you need to increase dosage for a day or two. What happened with my daughter is she would hold it so much that she has now stretched her intestinal muscles out and her nerves are damages in her intestines, that she can not "feel" it. And her body dosen't move the poop like it should so it sits in her small intestines to long, and in the small intestine is where moisture,water, is pulled out of the poop, so it sits there and sits there and guess what...she becomes constipated. So i have to give her the miralx to keep it moving. If you need anymore help or have any questions you can email me at ____@____.com, my name is D.. I have been dealing with this for a long time, and have made several trips to DuPont childrens hospital for this.
Good luck.