Final answer:
The warning labels on children's multivitamins relate to the danger of overconsumption of certain nutrients, particularly micronutrients like vitamin A and niacin.
Step-by-step explanation:
The warning labels on children's multivitamins relate to the danger of overconsumption of certain nutrients, particularly micronutrients. Some vitamins and minerals can be toxic at high doses, so it is important not to consume too much of them. For example, overconsumption of vitamin A can be toxic to the liver, while too much niacin can cause peptic ulcers and other health issues.