Slate weighs this new research:
Over an 18-month period in New Zealand, 43 babies had a “life-threatening event,” and nine of them stopped breathing while restrained in an infant semi-reclined car seat. Their little heads nodded forward, and, without much in the way of neck to stop them, pressed against their chests. This cut off their oxygen supply. The babies in the study didn’t die, but according to another study, other car seat sleepers apparently have.
Aganist this information:
Crashes kill about 1,200 children a year under the age of 12 in the United States. According to a 2005 study based on the federal Fatality Analysis Reporting System, infant car seats reduced the chance of dying in a crash by 71 percent, and car seats for children ages 1 to 4 reduced the death rate by 54 percent.
Seat belts are pretty good at lowering the death rate, too; they cut it 47 percent for children under the age of 5. In the New York Times Magazine last year, economist Steven Levitt and journalist Steven Dubner argued that this means child seat-belt laws “would likely do just as well—without the layers of expense, regulation and anxiety associated with car seats.” I wish they were right. But they’re not. Their article prompted a response by Dennis Durbin and Flaura Winston, doctors at the Children’s Hospital of Philadelphia and leading researchers in this field. Durbin and Winston tartly pointed out that car seats are a lot more effective at preventing injury in nonfatal crashes, of which there are 450,000 a year. According to Winston, for kids under the age of 6, car seats win out over seat belts at injury prevention by 30 percent to 40 percent.
And considers that:
A 2000 study found that 9,000 children who fell when their parents put the car seats down on tables or counters—because they weren’t buckled in or because the car seats tipped over—had to be treated in the emergency room.
Also note that the AAP recommends children remain in carseats until they reach 57 inches and 80 pounds, and the requirement in many states that children reach “8 (years) or 80 (pounds” before they stop using car seats.