DS has been constipated for many months now and it is getting worse. He drinks like a sparrow and I really think more fluid intake would help. The ERIC website suggests that at four years old he should have 6-8 drinks of 150-175ml a day. So at a minimum should take in 900ml a day. I would say he has barely half that amount a day. We constantly offer him water, which is also in easy reach for him all day. He is just not interested. Any tips that worked for you and your children?