WASHINGTON, D.C. -- The U.S. Consumer Product Safety Commission is issuing one of the largest child product recalls in its history.

At least two deaths are prompting retailers to recall about 900,000 Simplicity 3-in-1 and 4-in-1 convertible "close-sleeper" bassinet models.

Melissa Brotherton's six-month-old niece Kennedy was found dead between her bassinet mattress and side railing.

Of the loss, Brotherton said, "you're used to hearing her. You're used to hearing her giggle or make whimpering noises."

Four-month-old Katelynn Simon died the same way.

Of the models being recalled, Jamie Schaefer-Wilson of Consumer Reports said, "You need to detach the fabric to turn it from a bassinet into a co-sleeper so that you may actually push the bassinet right up against the adult bed. The problem is it can create a dangerous opening which would actually allow a baby to slip through and become entrapped or strangle or suffocate."

Newer Simplicity bassinets are built differently, eliminating the hazard, with the fabric permanently attached to the lower metal bar in the frame.

Consumer Reports said that full-size cribs are a better choice. "Bassinets are only covered by voluntary safety standards," said Schaefer-Wilson. "And there's actually no safety standards to cover them at all when they're used in co-sleeping mode."

This recall and the lack of any required standards for bassinet manufacturers is leading to a list of safety standards to be developed by an international standards organization, WISC-TV reported..

This organization is recommending that consumers not buy bassinets or co-sleepers until agreed-upon standards are finalized.