Conversation: The conversation between human and AI assistant.
[|Human|] hi, i am very worried for my 2.5 year old son because when he was 2 years i cud feel a hard round born betwen his buttocks while standing i showed to doctor he looked at me and smiled so i am worried and would like to know why this and will this be cured will he have problems in future. Thanks and regards, naaz
[|AI|]  Welcome to the ChatDoctorI have gone through your question and understand your concerns but don't worry. Human beings vertebral column is made up of multiple spinal bones. The lowermost is named as coccyx. Since the number are variable, it can be felt as bony prominence in between buttocks. In fact, it's a remnant of tail which was present in our mammalian ancestors. So, don't worry. The finding in your child is perfectly fine if it's not bothering him. Ignore it. Hopefully this will help you. I would be happy to help you in any further questions. Take care.