When can my child use backless booster seat?. Más información aquí – When can a child move to a backless booster
Your Child is Ready for a Backless Booster When . . .
- Your child is at least 5 or 6 years old.
- They can sit still without leaning forward or to the side, slouching, fooling around, etc.
- Your child is at least 40 pounds.
- Your child is at least 38-43″ tall.

While any child older than four can legally ride in a backless booster seat, safety experts are more conservative with their recommendations. Car seat experts recommend that children stay in high-back boosters for as long as possible, although older children can use backless seats up to 100 pounds.
Typically, this is when they have reached 4 feet 9 inches in height and are 8 to 12 years of age. Most children will not fit in most vehicle seat belts without a booster until 10 to 12 years of age.

40 pounds
An average 40-pound child is typically closer to age five, a much safer age to consider making a transition to booster use. And many booster seats that can be used in both a highback and backless configuration have a higher minimum weight limit of 40 pounds when used in the backless mode.
California Law
(California Vehicle Code Section 27360.) Children under the age of 8 must be secured in a car seat or booster seat in the back seat. Children who are 8 years of age OR have reached 4'9” in height may be secured by a booster seat, but at a minimum must be secured by a safety belt.

All children whose weight or height exceeds the forward-facing limit for their car safety seat should use a belt-positioning booster seat until the vehicle seat belt fits properly, typically when they have reached 4 feet 9 inches in height and are 8 to 12 years of age.
Even big kids need to be safe in cars! NHTSA recommends children remain in a forward-facing car seat with a 5-point harness until the child reaches the top height or weight limit allowed by the seat. At which time, the child can move into a belt positioning device.
Be at least 5 years old.
Meet the weight and height minimums for the booster seat you're considering. Be responsible enough to sit properly 100% of the time, even while asleep. Have a safe belt fit.
Consumer Reports says high-backed boosters are safer than backless ones because they do a better job of properly positioning the seat belt across the child's chest, hips and thighs. The Centers for Disease Control and Prevention says booster seats can reduce a child's risk of serious injury by 45 percent.
A child is ready for a booster seat when they have outgrown the height or weight limit of their 5-point harness car seat. This is usually when they reach over 65 pounds or 49 inches. You can check your car seat's manual for its height and weight limits and if it can be converted to a booster seat.