my Lil man is 5 wks old and today when I was patting him on the lower back I felt a knot.. i thot it was the diaper kinda bunched up and then forgot about it but just now I felt it again.. i think it's his tailbone... does anyone else lo have a tailbone that kinda sticks out? I'm wondering if I should be concerned or if it's normal.. can't remember with my little girl.. he doesn't seem to be in pain or anything, it's just weirding me out!