I’m here for the same issue. My daughter had a pull through done when she was 2 and is now 4. She will be starting school soon and I am nervous about her poop smears. We’ve resorted to panty liners when she started potty training a year ago. Some days have been good and some days not so much with the smearing.
I know it’s diet related but I haven’t found the correct diet for her. Everyone must understand that there are 2 types of fiber: insoluble and soluble fiber. Insoluble does not absorb water while going through the intestines and soluble absorbs water and becomes more gel-like. Insoluble keeps its form and helps move along other poop which are otherwise clumping or hanging out in the intestines. Soluble fiber absorbs water to make it easier to pass stool also making stool more liquid. I try to keep my daughter on a high insoluble fiber diet to maintain that bulkier stool to eliminate that smearing. I don’t want her to be constipated but thankfully I’ve never found constipation as a problem for her after the pull through. (She had about a foot of intestine removed during surgery idk if that makes a difference) It’s always been the issue with too much soft stool and smearing due to soft stools.
We are Asian and we have a lot of rice in our diet. Rice is an insoluble fiber and I’ve noticed that on days when we intake a lot of rice she doesn’t have any smears but on days when we travel or when we just do more eating out she seems to smear more. I just need to do my research on other insoluble foods other than rice because rice gets boring if consumed in every meal.