i don’t recomend Miralax for constipation and i woudl not consider it gentle. I use Magneseium citrate as it is a natural laxative. Also check diet (too much rice or carbs) and fluid intake (too little water causes constipation).
Above all always talk to your pediatrician regarding any suplements for your child.
Same as Lori. It’s the only thing that works for my DD. We’ve been able to cut back to a very light tsp/day, less if I can get a LOT of fluids in her. Not thrilled about it, but..