Thank you for your question. If your breast implants feel tight at 18 months you should return to see your plastic surgeon. The concern is that you may have a capsular contraction.
If you are 18 months out form surgery and still tight then you should definitely be looked at by your plastic surgeon.
The natural changes that are going to occur after an augmentation are usually complete by 6 to 12 months. At this point you will not see any further change but you could be developing scar tissue or a capsular contracture. I would recommend that you see you surgeon for an evaluation who could give you good advise about what your options are.
Typically at 18 months there is very little changes to your final result. Without the benefit of an exam or photos it is difficult to pinpoint your concern. I would set up an appointment to talk to your plastic surgeon and they will be able to examine you and have a discussion about your concern. Good Luck.
Thank you for your question. I think all plastic surgeons would agree that after 18 months your breasts should be soft and natural. Either you had a hematoma in each side after surgery which was not addressed, or you are one of the rare capsul formers. There are some patients who create scar tissue(capsul) around the implants resulting in an unnatural appearance and feel. Consult with your plastic surgeon to determine the cause.