my daughter has the same kind of BM... I just make sure she gets atleast one glass of 100% apple juice a day. It helps keep her little body regular. I finally got a juicer so now I get to give her fresh juice each day which is much better for her body. There are other juices that work in the same way, I'm not sure what they are.
I have also just been offering as many fruits and veggies as possible and when I make things like banana bread I use whole grains...oat flour... wheat germ..whole wheat flour... when I buy bread or bread like products I always purchase 100% whole wheat products..
food these days aren't that great for us....they are packed with perservatives and are bleached or stripped of their nutrients and then it is added back.. I try not to buy too many processed foods..