Can I play competitive softball after having a breast augmentation?

Thank you for the question. Long-term patients who undergo breast augmentation surgery (barring any complications) should be able to return to all activities with full strength. 
Timing to return to specific types of exercise will vary from one patient to another. Best to check with your plastic surgeon for specific advice. Generally, I suggest patients gradually ease back into the strenuous aerobic exercise 4 to 6 weeks postoperatively, assuming that they are doing well and there have been no complications. Lower body exercise can generally be resumed 2 weeks postoperatively. Use common sense, listen to your body, and gradually resume previous activity. In my practice, I ask patients to avoid contact and strenuous exercise involving the pectoralis major muscles ( such as push-ups, bench press, burpees, dancing on a pole…) for at least 3-6 months. 
  Best wishes.

Dear xx_jmc,you should be able to return to your normal activities once you are fully recovered. If you are considering a surgery, I would suggest you to consult a board-certified plastic surgeon.Daniel Barrett, MD, MHA, MS 
Certified, American Board of Plastic Surgery 
Member, Am. Society of Plastic Surgery