Wow. I found this great answer to that question on carseat.org...
"Babies have heavy heads and fragile necks. The neck bones are soft, and the ligaments are stretchy. If the baby is facing forward in a frontal crash (the most common and most severe type of crash), the body is held back by the straps, but the head is not. The head is thrust forward, stretching the neck. Older children and adults wearing safety belts may end up with temporary neck injuries. But a baby's neck bones are soft and actually separate during a crash, and the spinal cord can tear. It's like yanking an electrical plug out of a socket by the cord and breaking the wires."
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