My son has had a dairy intolerance (allergy??) since he was born. I had to stop consuming all dairy while nursing. His main symptoms when he was smaller were extreme constipation - to the point of being hospitalized for impactions, extreme irritability, and bad tummy ache. So he's now 4 1/2 and for the past month and a bit we've been trying dairy again in the form of plain yogurt, and small amounts of cheese. We notice his poops getting harder again and he is soooooo irritable. Will cry at the drop of a hat, yells and screams, very very very short attention span, and just not the happy little guy he usually is. One other thing we notice that we aren't quite sure is related to the dairy is he has to pee ALLLLLL the time. Seriously. Yesterday when I brought him to preschool at 8:45 he went pee, he went again at 9:00 when the doors opened, I got there early at 11 and I heard that he had to go pee, so I brought him and when I talked to the teacher at 11:30 I found out he'd gone 4 times before I brought him at 11. So between 8:45 am and 11 a, he went pee 7 times. And this has been typical the past month (since introducing dairy). He probably goes pee at least 40 times a day. He drinks a significant amount....but not enough to need to go THAT much. He's had testing for diabetes before due to the constipation, and that test was negative. No complaints about burning during urination.