R.Y.
My 2 year old has frequent problems with constipation and in addition to more water, fruits, veggies and whole grains (and adding wheat germ, oatmeal, and flax seed) I give her Pedialax. It is an over the counter stool softener recommended for ages 2 and up (it used to be the same ingredient as Miralax but I think Miralax changed recently). I have also used glycerin suppositories when needed and Benefiber.