knot between baby ribs

anna

my husband noticed a knot between babies ribs in thr middle below the ribs kind of. it feel like naybe a bone. you can see it when she breaths. here is a photo of it. based on google it looks like it could be her xiphoid.. but she don't go back to the doc for at least 2 more weeks and kinda worried about it . anyone else baby have the same??