My son is 3 and did not start having trouble with constipation until age 2 or so... we tried a lot of things, fruits, juices, water, prune juice, fiber, decreasing dairy, etc., etc., and NOTHING WORKED until we tried Miralax. It worked the very next day after we started it, and he has not had a problematic BM since. My friend's pediatrician rx'd it for her daughter as an infant, so I know it can be used for very little ones. And as someone else here said, it is very safe and not dependency-forming like some laxatives are thought to be. They do recommend that you don't stop it immediately after your child has a couple soft stools, as it is likely they will revert back to constipation, but they do say that at some point, you can stop the Miralax and see if the child is able to continue producing soft stools. It is now available over the counter, and you can find the dosage-by-weight online, or you could ask the pharmacist. It isn't cheap, but I know I would have paid anything to help my little guy, plus it goes a long way, especially for the small dose you would give a little one. The Miralax website had some good coupons, so you could try that, or get a prescription, because that is probably even cheaper, if you have any insurance. I definitely recommend you try it... it was such a relief for my little boy, and for me not to have to watch him struggle and not be able to help him! MIRALAX WORKS!