Underboob buldge? Help!

Not sure how big this bulge is or if it’s truly a fat roll, but for what it’s worth, I kept wondering what was sticking out under my boobs. Turns out my rib cage was flared out after having 4 big babies. My PT taught me some diaphragmatic breathing exercises and some exercises for the transverse abdominals and my lower rib cage is noticeably less flared, and weird bulges in that area are hardly noticeable.