Answer:
Children's bodies are different from adults' bodies. They are more likely to get sick or severely injured. They breathe in more air per pound of body weight than adults do. They have thinner skin, and more of it per pound of body weight (higher surface-to-mass ratio).
I would say that the main purpose of the European Union is to strengthen the economy of the member states by merging their economies and by introducing one stronger, common economy - a stronger economy for the states means a better comfort of life in those states.