In one of the biggest car seat recalls ever, Graco is recalling a whopping 3.7 million car seats sold in recent years, with more models still under investigation, according to the National Highway Traffic and Safety Administration. The problem, it seems, is the red release button, also known as the harness buckle, in the center of the car seats, which releases kids from the seats and can become crucial in case of an emergency. Graco says the recall affects "harness buckles used on all toddler convertible car seats and harnessed booster seats manufactured from 2009 to July 2013." So far no injuries have been reported.

According to Graco, the recall models include the following Toddler Convertible Car Seats:

Cozy Cline, Comfort Sport, Classic Ride 50, My Ride 65, My Ride 70, My Ride 65 with Safety Surround, Size4Me 70, My Size 70, Head Wise 70, Smart Seat. Harnessed Booster Seats: Nautilus 3-in-1, Nautilus Elite and Argos.

More models are under investigation, most of them infant car seats, including the popular Graco Snugride.

As a result of this Graco recall, the company is offering new and improved buckles for free. To request one, call Graco at 800-345-4109 (Monday through Friday from 9 a.m. until 5 p.m.) or email them at consumerservices@gracobaby.com. To be notified of all Graco safety recalls, sign up HERE.