J.B.
Is there a special reason you're giving a toddler formula? Most people end the formula after the 1st birthday. I have a VERY picky eater who I gave toddler formula for a few months until he started eating a few other fortified things like cereal and oatmeal, but if you have a toddler who is eating foods and drinking any kind of other milk or eating dairy products -it shouldn't be a problem.