My son is very dependent with his milk and he doesnt want to eat veggies, fruits and rice. what should i do? what vitamins do i need to boost his appetite?

When I was little, my mom always tried to sneak in veggies whenever she gave me food; she gave me spoonfuls of rice and ulam in between spoonfuls of ice cream, or gelatin. So what you could do is slowly sneak in veggies or fruits that's mashed or chopped into tiny pieces.