PINEVILLE, Mo. (AP) - Federal consumer safety officials are investigating a bassinet design made by Simplicity after the death of a 4-month-old baby in southwest Missouri.

Authorities say the infant slipped out of the side of her bassinet feet first. She then became trapped, with her chest in a 4-inch gap between the railing and the top of the mattress. The coroner called the death an "accidental" asphyxiation.

The bassinet model is a "Simplicity 4-in-1." It was not part of last month's recall of 1 million other baby beds made by Simplicity.

A Simplicity spokesman declined to comment on the bassinet design because the case is under investigation. He said the company's "thoughts and prayers" are with the infant's family at this time.