Pediatrician indicated possible hip problems

[Guest guest]

I had to the pediatrician today for his 4 month check-up and

she told me have Dr. Van Bosse check his hips. She said that the

creases under his rear end (when he is laying flat on his stomach) are

shallow and seem asymmetrical to her. Does anyone have any experience

with anything like this? Could it have anything to do with his DBB?

He's in it 23/7 and I thought we were doing well. I would like to do

some research before we see Dr. VB on August 1st, but I don't know

where to begin. TIA

Anne