Depends on how often you will do laundry! Haha. My little one grew out of muslins very quickly. She generally preferred swaddles. We probably got about 3 zip swaddles.
I bought 5 pieces only and change each day. I didnt bought much. I did get one/two zip swaddle/velcro swaddle for night use.
Hellooo I bought 5 muslin swaddles and have 2 zip type! Not sure will use so many or not but I feel like it's alot already!