It is difficult to understand what you are seeing on the X-ray. The “lower 5 bones that look they are joined together” could be the sacrum which is made of 5 individual vertebra until they join together to form the sacrum.
The conjoined ribs are a variant of normal but could also indicate congenital deformity. If there is a scoliosis present at this early age, you would need to see a pediatric spine specialist at either Shriner’s Hospital or a Children’s Hospital near you.
Dr. Corenman