My daughter is not allergic to milk nor is she lactose intollerant. She can't handle the milk protiens. Her pediatrician said that this was what was causing her consitipation. She was lucky to have 2 dirty diapers a week. Then they would be very hard and dry. At age 2 we took her off of milk -- it is amazing the difference. Even when she has hard stools, they aren't so dry. I also try to make sure she gets 1 glass of white grape juice every day. This has seemed to help also. If you try the white grape juice, you want to avoid such brands as Juicy-Juice since it is has other (mainly apple) juices mixed in. Prepared apples (juice, sauce, canned, etc) can offen be consipating.