We usually recommend at least 2, so you would always have a spare set to change while you wash the other (although they can be wiped with a clean cloth to dry quickly).
Feeding your baby is a messy business, but it doesn't have to be with our bibs. Our silicone bibs are extra soft and catch all the crumbs, spills and drool. They have deep pockets, are dishwasher safe, and the snap buttons allow the bibs to grow with your child for as long as they need protecting from food.