Not as big as I want to be (Motiva implants). If a year later, everything has dropped, can I get another surgery and go bigger?

Hello and thanks for your questions.  If you had agreed on 380 and 280 were placed, this would be a very good topic to discuss with your surgeon.  If this was a mistake, your surgeon should be able to easily correct this by removing the smaller and inserting larger implants.  Regardless, you should not have to wait a year if going larger in size, and in fact you should be able to have larger implants placed any time after 3-4 months.Best wishes!Dr. Brown

Most patients are able to "go larger" at a second stage, once the breast tissues have expanded (after first-time breast augmentation). Sometimes, during this revisionary surgery, adjustment of the breast implant capsules is also necessary to achieve the desired outcome. Exactly how much larger you can achieve during the revisionary breast surgery will depend mainly on your physical examination and goals.
 Ultimately, careful communication of your goals (in my practice I prefer the use of goal pictures, direct examination/communication in front of a full-length mirror, and computer imaging) will be critical. 
Generally speaking, the best online advice I can give to ladies who are considering revisionary breast augmentation surgery (regarding breast implant size/profile selection) is:
1. Concentrate on choosing your plastic surgeon carefully. Concentrate on appropriate training, certification, and the ability of the plastic surgeon to achieve the results you are looking for. Ask to see lots of examples of his/her work.
2. Have a full discussion and communication regarding your desired goals with your plastic surgeon. This communication will be critical in determining breast implant size/type/profile will most likely help achieve your goals. 
In my practice, the use of photographs of “goal” pictures (and breasts that are too big or too small) is very helpful. I have found that the use of words such as “natural” or "C or D cup” or "one cup size increase" or "significant or noticeable change" etc means different things to different people and therefore prove unhelpful.
Also, as you know, cup size varies depending on who makes the bra; therefore, discussing desired cup size may also be inaccurate.
3. Once you feel you have communicated your goals clearly, allow your plastic surgeon to use his/her years of experience/judgment to choose the breast implant size/profile that will best meet your goals. Again, in my practice, this decision is usually made during surgery ( after the use of temporary intraoperative sizers). Viewing the patient's chest wall in the upright and supine positions, with temporary sizes in place, help select the best breast implant size/profile for the specific patient.
I hope this helps. Best wishes.

Of course you can! However, you should give your breast implants and your bew breast cup plenty of time to bond with you. Bigger is not alway better or prettier so choose wisely!Best wishes. Dr. Aldo