A survey of The Aesthetic Society members found the most common breast implant sizes fall between 300cc and 400cc. While larger and smaller implant sizes are available, sizes within this range typically provide a noticeable but natural-looking size increase for most women.
Choosing an implant is all about proportion. You want a size that balances your curves and fits your frame without being uncomfortably large or unsatisfactorily small. This is a decision you and your surgeon will spend plenty of time making together during the consultation process.