Can I give my 11 month old 1% milk && formula ?? Like switch between them ??

No. You can mix half milk with half formula at this stage but it needs to be whole milk up until they're 2 yrs old.

My dr told me to start mixing 1 oz of whole milk in each bottle of formula

Whole milk only. Do 25% whole milk and then 75% formula and a week later 50-50.

Thanxx lady's. I forgot WIC gave whole milk when they turned 1. Its been 5 years