How to wash a new white quilt with red lady bugs.?

The old wives' tales about vinegar only work if you use vinegar every single time you wash the quilt. It doesn't actually fix the colors permanently. Instead, try one of the products for catching loose dye in the wash water. Color Catchers is one (they look sort of like fabric softener sheets, but go in the washing machine), and Dye Grabber is another. That one's like a washcloth that you can use 30 times.