Has anyone else had their LO Tri-Vit (with iron and fluoride) or other vitamin supplements? I'm especially interested in experience with Tri-Vit, since that's the one we're giving DS, but any comments will be helpful. When I picked up the prescription, the pharmacist said that it could cause constipation and/or darkened poop. We have had that happen, but DS's poop has been stinky and explosive. I'm not sure how to describe the smell. I'm not sure if it's related to the vitamins or something else. BTW, Tri-Vit has Vitamins A, C, and D, plus iron and fluoride. Thanks!