Birth up to age two: Children should be securely buckled in a rear-facing car seat until the age of two, or until they reach the height or weight limits of the seat. Age two up to at least age five: Children should be securely fastened in a front-facing car seat when they outgrow the rear-facing car seat. Age five until the seat belt fits properly. Children should be securely restrained in a booster seat when they outgrow the front-facing car seat. The seat belt should lay across the upper thigh, not the stomach; and the shoulder belt should lay across the chest, not the neck. Once the child outgrows the booster seat: When the child’s height, weight, or age exceeds the requirements, he or she can use a seat belt. The seat belt should fit snugly across the upper thighs and the chest. The recommended height for the proper seat belt fit in 57 inches tall.