Will 650cc Breast Implants Drop and Have Cleavage?

Your breasts will drop. Natural tissue expansion occurs over three to four months, so you don't have to worry about not having "enough skin". However, you may get stretch marks if you don't have a lot of your own natural breast tissue or have  a tendency to develop them. It also depends on the quality of your skin - if it's supple and elastic, then you probably won't develop as many. Your cleavage after they've dropped depends mostly on how your cleavage was before surgery. If your breasts are naturally close together, then chances are you will have better cleavage than if your breasts are naturally far apart.

These are large implants. Depending on your skin characteristics and soft tissues, it will likely take 6-9 months to allow for the implants to drop. Predicting stretch marks is as impossible for the breasts as it is for the abdomen.

Without photos, it is hard to give you specific advice. However, 650 cc implants are large and you are correct to be concerned about the skin envelope. Hopefully, you have had this discussion with your surgeon. Implants that size put into a B cup breast are likely going to look like implant sunder a B cup breast. Make sure that this is the look that you are trying to achieve. Good luck with your surgery.