after formula does your baby really need whole milk?

Dominique • Myles John 3/8/16. Micah Robert 6/29/17 baby girl due 10/8/20
We are about to stop by almost one year old from drinking formula. He has tried whole milk and liked it fine. Does he really need the whole milk? Obviously if wants a bottle I will give it to him, but is it needed? 
  He eats 3 meals a day plus snack if he's hungry between meals and is in 98% of weight