Breastfed babies do not get constipated. Breastmilk is the perfect food and so easily digestible. I really wish the pediatricians knew what they were talking about with regard to this but they still treat breastfed babies like formula fed babies. They just don't know! The babies can definitely go a long time without pooping, even though it seems strange to us adults. A great resource for you would be kellymom.com. Look this up on there and you will get some more information on this topic. I exclusively breastfed my dd, now 5 years old, and my ds, now 9 months old. We had the same issue with my ds and he now at his age will still skip a few days without pooping but he went through the same thing around your baby's age...going a full week without pooping. I refused to do the suppositories or water or prune juice. One thing I did try was to give him a warm bath and he did poop right in the bath.