Watch out for the Miralax. Some have had success with it, but I have heard scary stories about side effects. I do agree with the concept, that you have to keep the stool soft and super easy to pass to get over the withholding. With DD I didn't want to use anything systemic (to "make" her go), so I used the Babylax liquid glycerin suppositories when she really needed a good cleanout. When she was getting the idea on letting it out, I went back to the solid glycerin suppositories. They are much less traumatic, and it is more of just the stimulation/sensation that gets the reflex going. Some parents have had success with stimulation alone, usually a lubed-up thermometer or finger. Now that DD has been going daily without the suppositories, she is learning her signals. And if she has a hard time going, I apply a little bit of "un-petroleum" jelly. Rubbing it around triggers the reflex, and the moisture speeds it out and keeps it from hurting. I recommend applying some jelly before all poops for a while, until she is no longer scared of them. HTH!