Weight limits for most seats range from 2065 pounds lb. Height limits also vary. These should also be used by children weighing about 40 80 lbs and who are 4 years and older. Each car seat has its own height and weight limits for rear facing children. A child can use the forward facing car seat as a booster seat if she weighs between 80 and 100 lbs. The height limit for most rear facing car seats is that there must be at least 1 inch of room between the top of the childs head and the top of the car seat.
The total weight an infant only seat can hold is 22 25lbs and a rear facing car seat can fit 40 45lbs with both pending on the brand and model. Foward facing seats should be used until your child reaches the maximum harness weight limit which usually ranges between 40 and 90 pounds or until they reach the maximum height limit which is. A booster seat raises the kid so that the lap and shoulder belt fit properly. In this weight bracker the seat harness drops off and the cars normal seat belt fastens around the car seat and the child. Most convertible seats allow children to sit rear facing up to 35 40 or 50 pounds. Generally children must be at least 4 feet 9 inches tall before they stop using a car seat.
As a rule of thumb there should be at least 1 of space between the top of your childs head and the top of the car seat with any less meaning an upgrade is necessary. Keep your child in a rear facing child car seat as long as possible in a seat recommended for their weight and height. Learn more about using a forward facing car seat including types to choose from and the age height and weight at which you might be able to make that change. Avoid moving your child forward facing too soon. Children who are too tall for a forward facing convertible seat whose ears line up with the back of the convertible seat may use a high backed booster seat. When the child is larger than 100 lbs or the specified weight by the seat manufacturer a booster seat is not necessary.