My daughter has had a really hard time with constipation the last 2 mo. or so. Her stools were HUGE! Honestly I had no idea that a baby could poop anything that size, I felt so bad for her, and they were as hard as rocks, just dreadful. We have tried different things to try to get them to change, prunes, extra water(which she just hasn't gone for), backing off on solids, EBM, upping her fruit intake....But what I have found that has worked the best is NOT feeding her any bananas, (which is sad because she loves them), or rice cereal, giving her at least half of a pear, (squished up/very ripe), and 1/4 to 1/3 of avocado, (again squished up, thankfully she loves avocado). Also, when she was younger, pre-solid days, it was not unusual for her to go 7 days without pooping, and her stool when it came was fine, now that she has started solids, if she doesn't go every day or two I get worried, because it usually means something is constipating her. I hope this helps, it is funny, in my pre-baby days I never thought that I would be talking so much about poop now....babies do change everything don't they I hope it gets better for you and your lo.