 Juice, Mom. Juice, juice, juice. Mommy, why are we going to the store? Mom, Mommy, Mom, Mommy, Mom. Your child will have different needs at different stages of life, and that includes the car seat. That's right, the car seat. A car seat isn't one size fits all. You have to have the right seat based on your child's age, weight, and height. See, car crashes are a leading killer of children ages 1 to 13.