it's perfectly normal. It's called the xiphoid process or xiphoid bone. As you get older the soft cartilage turns into a hard bone. If you ever debone a backed chicken, you get see it where the breast bones meet in the front. Mine is visible when lying down, with some people it sticks out more. When I lost weight, I noticed it more, so perhaps with the pregnancy, it didn't show as much. I also was worried when I discovered after losing the weight!
take care and enjoy motherhood, Laura
p.s. some people get stomach aches from taking Wellbutrin, it's a known side effect. Wellbutrin is an SNRI and I found I reacted badly to these with anxiousness and gut pain. I haven't found much that works for depression but have given up on these meds because of their side effects. I find a good pyschologist who practices Cognitive Behaviour Therapy got rid of the anxiety, along with giving up coffee!
I have the EXACT same thing post partum and it scares me!! Did you find out the cause?
Thanks for the comments and info. I noticed my Xiphoid process while laying down. It freaked me out!? However, I can see I am not alone. I feel fine otherwise. I am VERY vigilant with my health especially at 41 and getting older.
Good health and wishes to all!