I was born in 1953 with an opening at my tailbone. My mother never told me what it was. It is right at the tailbone and occasionally clean it with a q-tip. It does not bother me but I was wanting to know if it is a birth defect. I remember when my twins were born they were 3 months premature. I saw the same condition but there opening closed by the time they were considered full term. Can you tell me about this and what it is called. Thank you Rubie