How do I treat uneven breast size after pregnancy?

 Sorry, but there is use no way to improve breast symmetry, without surgical intervention.  If your breast size, shape, and/or symmetry are of concern, seek consultation with board-certified plastic surgeons who can demonstrate  significant experience achieving the times of outcomes you will be pleased with. Then, communicate your goals carefully as well. I hope this, and the attached link (dedicated to breast asymmetry concerns) helps. Best wishes.

Breast #Assymetry can surgically be corrected. Some patients experience satisfying results with a Breast Lift, or, Mastopexy. Breasts are often #asymmetric and can be lifted differently. The size of one breast may be reduced, or, different amounts of fat may be added to the breasts to improve symmetry. This is called the "#California Breast Lift" also known as "Natural Breast Enlargement". It is a method of transferring your own fat to enlarge and #shape #uneven breasts, without adding #implants.Also, if a Breast Augmentation is suggested, saline implants are also an option.Saline Implants allow the plastic surgeon some flexibility with sizing during surgery.
Often times a woman has breasts which vary slightly in size. If one breast is
slightly smaller than the other, each implant can be filled to a different
amount to create better symmetry.However, these are some options. Determining if you are a candidate would be discussed in greater detail with your Plastic Surgeon during a one-on-one consultation.