Can breast milk lead to fructose intolerance in my baby?

No. Breast milk contains lactose, a different type of sugar. Many formulas do, however contain fructose.
Many. Absolutely not. Fructose intolerance happens when you overload the intestines with to much fructose. Jams, jellies, apples, pears, mango, honey, maple syrup, soda, juices are all high sources of fructose. Breast milk has lactose. Not fructose. So this is totally fine.