"They" want to pass a federal law to require "safer" child car seats. "Safer" means rearward facing car seats are mandatory for children up to age FIVE. Speaking as a veteran parent, kids are gonna hate that one. Kids don't mind riding in car seats much, 'cause the seat boosts them up so they can see out the windows. Rear facing seats would retrict the kid's view to the back seat upholstery.
While "they" were at it, "they" want to require infants travel in car seats on airlines. Which would require parents to buy a ticket for infants. Right now, infants under two can travel for free sitting in a parent's lap. Many parents, including yours truly, decide that enduring transcontinental squirming is worth the savings.