My dd is 7 days old, the pead did do a newborn check but didn't look at this area. The only thing the pead noted was positional talipis. She also has a sacral dimple (it's only a small one and closed) But with this weired looking bottom crease is this something I need to be concerned about? Just wondering if anyone has children or themselves with this. Of course I will speak to midwife when she is out in a couple of days.