If yr b is over 6 months, u can boil the "bamboo cane, water chesnut, carrot, corn water" and give the b to drink 2-3 times, like just giving water. My b also had constipation 2 weeks ago. The poo is so hard that makes him have some blood and painful. But after gave him the bamboo water, his poo becomes so good (yellow and smooth, like cereal) and eat better because stomach more comfortable. Very effective. But if under 6 mths, pls consult yr doctor first.