Sorry I can't type Chinese here. Babies' 便秘 is caused by the iron in the formula and baby cereal. I found the best way to solve this problem is to give babies a lot of fruit and vegetables. My baby doesn't have this problem. She had a lot of baby cereal after she was 6 month old. And she had about 10-12 table spoon fruit and 6-8 table spoon vegetable every day.