25 y/o who wants kids in future. I would prefer a fat transfer but am concerned I am not a candidate and not sure about implants

Unfortunately, you have not provided photographs.  The technique I recommend is The Bellesoma Method.  This will reshape your breast tissue creating upper pole fullness without implants, elevate them higher on the chest wall and more medial to increase your cleavage.  Vertical scars are avoided, nipple sensation and the ability to breast feed are maintained.  At the same time or later, fat transfers can be performed if additional volume is desired.Best Wishes.Gary Horndeski, M.D.

Breast implants give consistent lasting results. Implants will keep their size if you lose more weight. Fat transfer is not a good option if you do not have sufficient fat to use.An exam and consultation with a plastic surgeon is recommended to discuss your options and expectations. 

Recommend that you schedule an in-office consultation with a board certified plastic surgeon who performs hundreds of breast procedures annually.  This is the only way you will be able to obtain an objective opinion regarding the best plan for you to achieve your ultimate goals.
In general, 200 cc per breast is typically the upper limit of fat injection recommended by most plastic surgeons.  It is not that more cannot be injected; but on average, this has been determined to be the most that can be expected to live during one transfer.  About 50% of the fat obtains permanence.  The fat must be injected through multiple planes in small amounts to the tissue through one tiny incision under each breast.  

It sounds like you have very little fat available for transfer which means implants is likely the only way to predictably raise you 1-1.5 cup sizes.  Be sure to consult with an experienced, board-certified PS.  Good luck, Dr. Greenwald

By your weight you sound very thin. As a general rule, fat transfer does not work in anyone who's BMI is too low. An implant might be a better choice for you. Implants do not have to be large.

Dear amelia.pond,Fat transfer breast augmentation is a viable alternative for women who desire larger breasts without the use of implants. Fat transfer is also widely used in reconstruction of the breast after a mastectomy or lumpectomy. It can also be very effective in correcting the size and shape of the breasts due to genetic problems such as tuberous breast or Poland Syndrome, two conditions that look like misshapen or underdeveloped breasts.In addition, the following scenarios are also reason to consider breast fat grafting:• If you have chest areas that appear creased and sunken• If you desire more permanent correction than is provided by temporary fillers• If you wish to improve your body contour, revise scars, fill bodily depressions and rejuvenate the natural curve of your breasts• To fill in contour irregularities or hide obvious signs of breast implantsYou should discuss your concerns with a board certified plastic surgeon and make sure your surgeon understands your concerns and your breast augmentation goals. Only after a thorough examination you will get more information and recommendations.Daniel Barrett, MD
Certified, American Board of Plastic Surgery
Member, American Society of Plastic Surgery
Member, American Society of Aesthetic Plastic Surgery

Amelia.  I completely understand your concerns about breast implants, however they have decades of proven safety and satisfaction among thousands of women and are probably the best option for you. It sounds like you do not have enough fat for transfer to your breasts to make much difference at all. Implants offer of a more reliable option for you.  Come see me or another board-certified plastic surgeon in the area for a full evaluation and exploration of the best options for you. Good luck.

There are two factors which limit the amount of fat which may be transferred to the breasts.1. Only 40% of total asirated fat is possible to be injected.2. The size and distensibility of the breast. Too much fat injected to the breast will result in fat necrosis.Patients with very little body fat are usually not suitable candidates for this procedure.Please consult in person with a Board Certified Plastic Surgeon experienced in this procedure prior to making treatment decisions.

I would suggest meeting with a board certified plastic surgeon, being examined, and discuss your options. Even with a fat transfer, you may only achieve up to one cup in size. If you want more, implants would be best.

I feel that implants will give you a more precise result. Where fat may be required to be performed several times to achieve the desired volume. Best of luck.