Is this bulge under breast in the middle the top part of my stomach normal? (Photos)

It's difficult to diagnose the nature of the contour that concerns you without an examination. It could be residual fat in which case it could be addressed by liposuction. It could be your natural anatomy. It could be from visceral fat or something else. The best choice would be to visit with your surgeon for an evaluation. She/He is most familiar with the details of your surgery and how you've been progressing through recovery.

Dear Graceful288455,
I understand your concern. However, without a proper assessment, it would be difficult to determine what is wrong. It is best that you visit your plastic surgeon for further assessment or ask for a second opinion. Only after a thorough examination, you can get proper recommendations and advice.
Daniel Barrett, MDCertified, American Board of Plastic SurgeryMember, American Society of Plastic SurgeryMember, American Society of Aesthetic Plastic Surgery

Thank you for your question and photos. Based on these photos it is not possible to differentiate if this is just excess fat in the upper abdomen or actually separation of the muscles. This can happen from the sutures pulling through the tissues or your surgeon did not dissect up to the xiphoid or bottom of your breast bone to repair the muscles. An in person physical examination is needed to determine which procedure will help you resolve this issue for you. See a board certified plastic surgeon for an in person consultation/evaluation. Good luck.