I’ve watched my daughters fiber intake and just making sure she drinks a ton of water and it’s worked wonders. She has chronic constipation. I have her down to less than a half dose of mirilax and she has two fiber gummies a day.
My sister has been on an off miralax since she was 2. She’s almost 4 now. It’s the only thing that helps! I would talk to your doctor about it if the regular things like prune juice, constipation ease, water.. etc don’t help