Children ages 4 though 8 use booster seats to elevate them so seat belts fit them better. The agency says it's giving top marks to 21 out of 72 booster seats or about 30 percent. Last year, it only recommended nine booster seats.
A study last year found that children who ride in booster seats in the back seat are 45 percent less likely to suffer injuries in crashes compared to children who only wear seat belts.