R.M.
I found this list of foods that will cause/aggravate diarrhea and when my son was too solid, I tried to feed more from it. When he was too loose, I avoided them. For a quick easy way to remember it, the foods that start with P are the foods that make you poop- peaches, pears, prunes, plums, peas. Prunes always worked the best, don't overfeed those, or it can be a disaster :). I keep my son regular by alternating the Poop foods with the non-poop foods. If he eats an apple he eats some peaches too. If he has too many pears, he get a banana. The whole website is very helpful for feeding questions, by the way.
http://www.homemade-baby-food-recipes.com/feeding-a-baby-...