Dear Andrea, If indeed you are 34 A cup, a 600 cc implants will incease your breasts by 4 sizes which means that you will end up with a 34 DD cup size. If that's ok with you from the apearance stand point, safety is realy a non issue when done by an experienced board certified plastic surgeon. I would like you, though, to reconsider silicone implants for saline implants for the following reasons : 1. silicone implants cost 3 times more than saline implants. 2 The incision for large silicone implants has to done in the sub mammary crease which is not scar friendly and due to the large size of the implants the incision will be very long. On the contrary, saline implants, regardless of the size can be inserted through a small incision under the areola which is scar friendly. 3. The sub areola incision allows to an easier pocket dissection with nicer cleavage and more precise new sub mammary fold. 4. When saline implants rapture , it is very simple to replace, where as silicone removal is complex. I hope this helps. Always check the before and after pictures of your surgeon, to make sure that they are numerous, consistent and you like them. Also, check the reviews. Best of luck, Dr Widder