Belly button

My son is 14 days old, he had an appointment the 23rd he got an ultrasound done on his kidneys, well they had to lay him on his belly an once I got home I noticed his umbilical cord wasn't there, well he still bleeds a little an it looks Like he still has a little bit in a scab on it.. I've been cleaning it an keeping it dry still... Has anyone else had this problem???? My two oldest kids never had that issue!