My son has a pretty pronounced dimple.. They did an U/S of his spine. He doesn't have any spinal issues but it was worth looking at IMO.
Birthmark on lower spine, sacral dimple...help! *UPDATE* WITH PIC AND DR.'S OPINION - Page 2
I have one, significantly deeper and more noticeable than the OP's baby. No tuft of hair or stork bites though.
I think it's certainly worth it to look into, but in my case, it came to nothing.
I grew up with no issues related to it. I potty trained early, walked at 12 months, no allergy issues, and was very physically active as a child and teenager. I was competitive in gymnastics for 10 years, ran hurdles in track and field, and off and on did soccer, basketball, and softball through childhood.
But like I said, I'd probably get it checked out.
My 4th baby was just born and is in the hospital for Low Imperforate Anus, about to have surgery.
On a totally unrelated note, he also has a sacral dimple and just had the ultrasound--because he is here and they're checking *everything* because of the other issue. While the surgeon who will be doing his surgery tomorrow has not been in, his pediatrician has, and he said the US was totally normal. My 2 year old son also has a sacral dimple and no issues. My husband says they have my butt, so apparently I have one too. ;)
So...since 2 of my kids have it and it's nothing, I'd tend to agree with the pedi and say that it is nothing.