Question: what are the best vitamins for a 3 year old?
Answer: Calcium. "Calcium is the essential building block of bones and teeth," says Andrea Giancoli, MPH, RD, a spokeswoman for the Academy of Nutrition and Dietetics. ... 
Fiber. ... 
B12 and Other B Vitamins. ... 
Vitamin D. ... 
Vitamin E. ... 
Iron.