3 months PO. How to soften hard boobs?

The firm feeling could be related to scar tissue or capsular contracture.  Massage may help both of these issues.  I would consult with your physician.  If capsular contracture is diagnosed, there are early therapies which could be implemented to reduce the firmness.

Possible reasons that you might have firm breasts 3 months after breast augmentation/mastopexy include: 1. you started with a tight skin envelope and placed implants that are slightly oversized for the skin. If this is the case, it might just take time and massage to soften things up.  2. You have saline implants that have been overfilled. If this is the case, then no amount of massage or time will help. If you have silicone implants, this is not the problem.  3. You have developed a capsular contracture. This would be unlikely if you are having the same issue with both breast implants. 

In most cases the breast implants are much softer after 3 months post breast augmentation with lift.  You need to be examined by your plastic surgeon to check for the possibility of capsular contraction.  In addition if the implant pocket is to small the implants can feel firm.During your visit to your plastic surgeon discuss the possibility of breast implant displacement exercises as 1 possible method to soften your implants.  However if you have capsular contraction than a revision may be necessary.