Walmart is doubling down on car seat safety for National Baby Safety Month with a first-of-its-kind recycling event. The longtime top retailer kicked off a car seat trade-in event Monday that will span nearly 4,000 Walmart stores in the U.S. until Sept. 30, according to Walmart. Customers can take used car seats to the service desk at participating stores and trade it in for a $30 Walmart gift card that can then be put towards other baby items and used online or in stores. Walmart joined forces with private recycling company, TerraCycle, for the sustainability initiative and said each component of "traditionally non-recyclable car seats" will be diverted from the landfill.   "Safety -- especially car seat safety -- is a top priority for Walmart’s Baby department, so we wanted to use our size and scale to create an event that offered unprecedented access to trade in an outgrown car seat for a gift card," Melody Richards, vice president of Walmart Baby, said in a statement.   TerraCycle CEO and founder, Tom Szaky, added, "We are proud to work with this forward-thinking company to offer families from coast-to-coast a way to give their car seat, the item that has kept their little ones safe, a second-life. Through this event, we expect to divert the plastic equivalent of approximately 35 million water bottles from landfills."   For more about the gift card terms and conditions visit the company's website.