Is it unsafe for a rear-facing child’s legs to touch the vehicle seat while rear-facing?

No, it is not unsafe. Only a very small number of children in rear-facing seats sustain lower extremity injuries, a rate significantly lower than those facing forward. Children are naturally flexible and can comfortably accommodate their legs touching the back of the vehicle seat. The potential for leg fractures is far less critical than injuries to the neck or spinal cord, which are more common in forward-facing scenarios.