Can I wear a waist trainer after a Breast Augmentation?

At five weeks postoperatively, one is almost although not quite completely at the point where healing is as strong as it will get. Wearing a lower body binder is certainly possible although you should discuss this with your surgeon. If there is an incision on the crease below your breast, it would be wise to avoid the seam of the binder rubbing on the incision. Possible options would include padding this area to avoid undue motion at this point. Check this out with your surgeon.

This is very dependent on multiple factors: the location of your incision (under the breast vs under the vs in the arm pit), the size/style of your implants, how you have recovered/healed up to this point, etc.  If you have a healing incision where the trainer will put pressure or still have significant swelling and the implants have not "dropped" yet, this could effect your long-term result.  For the majority of my patients, I recommend that they do not even wear an under-wire bra until a minimum of 6 weeks after their surgery.  This is a question that you should ask the surgeon who performed your procedure - they would have the information necessary to give you the most complete answer to your question.  Best of luck with your recovery

At 4 weeks after a breast augmentation, I release my patients to full activity and use of any type of clothing they desire as long as they have healed completely  and continue to massage the breasts 3 times a day for more than 5 minutes at a time.