Hey there,
I am sorry to hear you toddler is struglering going potty, no fun
My DD was on miralax and it worked good for her, however i wanted somehting more natural and added epsom salts baths (it has magnesium and sulfate, which gets absorbs thorugh the skin. Magnesium is a natural laxative). She is also on high doses of probiotics (we use a hypoallergenic one form kirman lab), two capsules a day.
I would do miralax every other day to give his body a chance to try going on his own. That’s i what i did when Kendra was on it. It worked well.
I hope that helps.
Leo