The U.S. Consumer Product Safety Commission has issued a stern new warning for a popular Fisher-Price baby product after at least 13 babies died: Never use the rockers for sleep.

Driving the news: CPSC and Fisher-Price issued an alert Tuesday for the company’s Infant-to-Toddler Rockers and Newborn-to-Toddler Rockers after "at least 13 reported deaths" occurred between 2009 and 2021.

Flashback: In 2019, Fisher-Price recalled more than 5 million Rock ’n Play baby sleepers after 30 babies died in a 10-year period.

What they’re saying: “Parents and caregivers should never use inclined products, such as rockers, gliders, soothers, and swings, for infant sleep and should not leave infants in these products unsupervised, unrestrained, or with bedding material, due to the risk of suffocation,” the commission said in a statement.

Meanwhile, the commission "finalized a rule requiring that infant sleep products have a sleep surface angle of 10 degrees or less" that goes into effect on June 23.

Fisher-Price said it has videos, additional safety information and warnings for the rockers and other products on its Safe Start webpage at www.fisherprice.com/SafeStart.

The following are recommendations for safe sleep from the commission:

Editor's note: This article has been updated with additional information.