Bowel preparation: Children greater than 2 years of age: 1.5 g/kg/day Maximum dose: 100 g daily Usual Pediatric Dose of MiraLAX for Constipation -- Acute: Occasional constipation: Children greater than 6 months of age: 0.5 to 1.5 g/kg daily (initial dose 0.5 g/kg; titrate to effect) ...