Graco is charged with a $10 million penalty for not making a timely notification of a defect associated with the largest car seat recall in U.S. history, according to the National Highway Traffic Safety Administration (NHTSA).

The first $3 million is due now and the company has five years to pay the remaining $7 million unless the company spends an equal amount on child safety improvements, said the agency.

The recall was initially launched in December and involved more than 4 million convertible and booster seats with defective buckles and another 2 million rear facing infant seats. Parents had been complaining about the problems with the buckles and ultimately it lead the agency to pressure Graco into announcing a recall, said the NHTSA.

“Parents need to know that the seats they trust to protect their children are safe, and that when there’s a problem, the manufacturer will meet its obligations to fix the defect quickly,” Transportation Secretary Anthony Foxx said in a statement.

The company says it is prepared to move forward and invest in child safety initiatives.