Side effects of excess vitamin K include enlarged liver, pale skin, increased sweating, shortness of breath, muscle stiffness, edema, irregular breathing, decreased movement or activity, swollen eyelids, or red skin. In infants and newborns, vitamin K plays an important role in preventing and controlling bleeding, especially bleeding in the brain and meninges. At the same time, it can combine with calcium to help strengthen bones. However, excess vitamin K can also be very dangerous as it can cause hemolysis, jaundice, and cerebral palsy.

To know which vitamins a 1-year-old, 2-year-old, or 3-year-old child needs, parents must understand the child's needs to provide sufficient essential vitamins and minerals.