When to change your child's car seat? According to @Safe Kids Worldwide don't be in a rush! Use your current car seat until your child reaches the maximum weight or height limit listed on the label. D... View MoreWhen to change your child's car seat? According to @Safe Kids Worldwide don't be in a rush! Use your current car seat until your child reaches the maximum weight or height limit listed on the label. Don’t be in a hurry, because every step forward reduces safety just a bit. Why? If you are in a front-end crash (the most common type of crash) a rear-facing car seat allows your child’s head, neck and spine to move evenly into the seat, not away from it. Each seat is designed for maximum safety at a specific weight, height and age.