In this case,"The type of booster seat your child needs depends on several things, like your child's age and size”.With this said not all children are required to use the same booster seat, some children are overweight some are skinny.The age has a big difference to when it comes to a child using a booster seat because what if the child is 6 years old and the parent gets a big booster seat her just because of her age but what if the child's body is small the booster seat will eventually be too big for her you need to be casus when it come to getting a booster seat for your