Formula too early?

Rachel

My baby is 1 week old. I've been breastfeeding all week but my nipples are very sore. I really want to breastfeed but feel like I just need to give my nipples a break. Will it be detrimental to feed him formula for just a meal occasionally when I need it for relief? Seems like my son is constantly hungry (great problem to have!) so I'm not getting much of a break.