In a normal breatsfeeding situaton you shouldn't need one and I wouldn't buy one until absolutely necessary because the warranty starts from the ay you purchase it not the day that you start using it......we bought ours early knowing our bubba would have to go to special care and I would need to express.....in hindsight I would leave it to as close as possible to the birth date for the warranty as ours broke down just out of warranty but would have still been in warranty if we had waited a bit longer to purchase it if that makes sense......