I Have A 5 1/2 Month Old Girl Who Is Solely Breastfed, Well Besides Cereal. My Milk Supply Is Starting To Decrease And My Back Up Supplies In The Freezer Is Slowly Going. I Work Part Time And Pump At Work, But That Is Still Not Enough. Can I Sub With Formula When At Work Then Breastfeed When At Home? That Will Totally Decrease My Supply. Will It Hurt The Baby?:)