Does she eat a lot of cereal? Cereal can be constipating itself, esp rice, and the iron can make it worse. I would cut way back on cereal and stick with fruits and veggies. Also, I would cut back on solids a bit in general and increase the milk intake.
To Trenell, MizKerri and geeky:
I pray none of you ever has to live in a communist state.
Geeky is my hero. She's the true badass. The badass who doesn't even need to be a badass. There aren't enough O's in cool to describe her.