First of all, there are additives in the raw materials for making these things. Secondly, butter is used in these foods, and there are two types of butter. One is margarine, which is widely used. The main raw materials are trans fats, spices, pigments and other additives, which are quite harmful to the human body. Although children's digestive system is better, they can't digest it if they eat more, especially pastry, butter biscuits and fresh cream cakes, which are basically trans fats.
Another kind of butter is pure animal butter. There is fat extracted from milk, which is basically imported and expensive.