34AA wanting full B cup and natural look. How to choose between 225cc and 205cc?

Appropriate breast implant size is determined by your breast measurements, your frame, existing breast tissue and size you desire.

Generally, 200 to 225cc should not be too dramatic a difference in cup size. Patients usually opt for the larger size provided their measurements will accommodate.

I frequently use sizers during surgery to confirm final implant size.

Further discussion with your surgeon is recommended until you are comfortable.

Both of the implants you are considering are conservatively sized. The difference of 20cc is equal to just under 1 1/2 tablespoons of fluid. I often use sizers during surgery. This allows me to determine which implant fits the breast space best when a patient is deciding between implant sizes.