We’re all aware that many of us in the U.S. are heavier than we should be, but we should also be aware of the special considerations that may be needed to safely transport heavier children.
Rates of childhood obesity (kids whose bodies are greater than the 95th percentile of the body mass index or BMI, for their age) have doubled in the past 30 years for kids ages 2 through 5, and have tripled for kids between 6 and 11 years (see the report in Pediatrics.)
At the same time, new research in child safety and the benefits of child restraints in protecting kids in a crash have become more evident. Child seat manufacturers are also recognizing the trend toward higher-weight kids and are producing seats that are more accommodating.
What’s safest for all kids
• All children of any size or weight should be properly restrained in the back seat of a motor vehicle and in an appropriate child restraint.
• Smaller kids (up to 23 months) should ride rear-facing as long as possible up until the rear-facing limits of their convertible seat.
• Toddlers should ride in a harnessed forward-facing seat as long as possible.
• Children should ride in booster seats until the adult vehicle belts fit properly (usually not until they are about 4’9” tall).
• Children should not be transported in a child restraint in which they exceed either the height or weight limits.
Challenges for overweight kids and what you can do
• Just because a child weighs enough to move to the next level seat doesn’t mean he is behaviorally ready, or that their musculoskeletal system is strong enough to take the same forces of a vehicle crash as an older child, without additional risk of injury.
• Each step “forward” to the next type of child restraint (rear-facing to forward-facing, booster seat to vehicle seatbelts) actually represents a step “backward” in terms of the level of safety provided to your child.
Challenge: The rear-facing limit of most infant seats with carriers is around 22 lbs. Heavier children may exceed these limits as early as 4 months old.
What you can do: When your child reaches the limits of their infant car seat, transition them to a rear-facing convertible model that has a rear-facing weight limit of 30 lbs. or more, and don’t move them forward-facing until they’ve reached that weight. Or, consider a new rear-facing infant seat that has a rear-facing limit of 30 lbs. or more as well. This option allows you to keep using an infant carrier.
Challenge: The weight limit of many forward-facing five-point harness seats is 40 lbs. and many toddlers exceed this limit long before they’re ready for a booster seat or a vehicle belt.
What you can do: Look for new models that have higher harness weight limits. In 2005, there were only about four seats that accommodated kids weighing more than 40 lbs. In 2009, there are about 15. A list of higher-weight harness seats is available at http://www.aap.org/family/Carseatguide.htm or http://www.cpsafety.com/articles/over40.aspx.
Also, consider a model that lets your child stay in a five-point harness until she is 50 lbs. or more, and then transition to a belt-positioning booster for the next step. If a child is large enough that even the higher-weight seats are too big or if they are too wide to fit most of these seats comfortably, you may want to consider a travel vest. At least one has a limit of 168 lbs. (See http://www.aap.org/family/Carseatguide.htm for information.)
Challenge: A child in a forward-facing seat installed with LATCH weighs more than 48 lbs., but many vehicles limit the use of LATCH or the top tether after a child weighs between 40 and 48 lbs.
What you can do: Consult your vehicle’s owner’s manual to see if a limit is specified for the lower LATCH anchors or top tethers. If your child exceeds the limit you may have to re-install your seat with the vehicle belts rather than LATCH.
If you’re not sure, or your vehicle manual doesn’t specify, consult with a child passenger safety technician or stop at a child seat checkpoint to find out. For a checkpoint in your area see http://www.seatcheck.org or http://www.nhtsa.dot.gov/cps/cpsfitting/index.cfm.
--Jennifer Stockburger, program manager, vehicle and child safety