You feel guilty about every single thing, every decision you make, everything you do,” the Grammy-winning superstar, 32, tells PEOPLE in a candid new interview at the Nashville-area cabin she shares with her husband of five years, NHL star Mike Fisher, and their 7-month-old son Isaiah Michael.
When it comes to breast-feeding Isaiah, she says she plans to keep it up for “as long as I can take it. It’s hard. My supply is pretty nil. We have to supplement with formula. I’m doing the best that I can, you know?”
For more, pick up your own copy of People.