What fun! Well, my babies would get constipated as well. It is the rice cereal. I did a couple of things: my dr. suggested to mix about 1-2 TBSP of Karo syrup in their cereal when I made it. This really helped. Also, since I nursed my children, I did not make their cereal with formula, I made their cereal with juice. Since they were constipated, I made it with prune juice. One more thing, I also started giving them the oatmeal cereal 1x a day. Rice in the morning, and oatmeal at night. Unfortunately, my kiddos could not drink apple juice in cups. I think the acidity of it really gave them bad diaper rashes. So, I stuck with white grape juice and sometimes mixed in some prune juice. Have fun and hope these ideas help your little one.