Which spinal curvature is associated with the lower back and appears when a baby begins to walk and sit up? A) Cervical B) Primary C) Lumbar D) Thoracic E) Sacral

The spinal curvature you're thinking of is the lumbar curvature! As babies start to walk and sit up, their spines develop this important curve to help support their growing mobility and weight. It's nature's way of keeping them balanced and aligned as they take their first steps into the world. Speaking of development, did you know that these curves in the spine help distribute weight evenly across the vertebrae? This way, they play a crucial role in maintaining good posture and preventing back pain later in life. So, those cute little baby wobbles contribute to a lot more than just helping them get around!