My daughter went through the same thing for awhile. I gave her prunes and then about 1oz. prune juice & 1 oz. water. Other fruits that help are peaches, pears, and apricots and apple juice. And even giving her just water may help too. Also if she's eating rice cereal I'd switch her to barley or oatmeal. And If the above doesn't seem to help or if she's going 3-4 days without going I'd take her to the dr. At one point, the dr. had to give me something for my daughter so she would go.
at 10:01 PM on Feb. 2, 2009