A method to form a mixture containing at least one of 2′-FL (2′-O-fucosyllactose, Fuc(α1-2)Gal(β1-4)Glc) and 3-FL (3-O-fucosyllactose, Gal(β1-4)[Fuc(α1-3)]Glc) characterized in that DFL (difucosyl-lactose, Fuc(α1-2)Gal(β1-4)[Fuc(α1-3)]Glc) is subjected to partial hydrolysis, e.g. enzymatic hydrolysis or acid hydrolysis.