WASHINGTON -- The head of the Consumer Product Safety Commission on Tuesday promised swift action to get dangerous products off the market, acknowledging that the agency didn't move quickly enough on a record recall of more than 2 million cribs linked to four deaths.

"We were not advancing this case as quickly as possible," Chairman Inez Tenenbaum said in an interview with The Associated Press. "So, I put all of the resources for the agency on this project so that they could accomplish this goal of recalling the crib."

At issue are some 2.1 million drop-side cribs made by Stork Craft Manufacturing of Canada. Four infants suffocated in the cribs.

CPSC said the recall involves 1.2 million cribs in the United States and almost 1 million in Canada. Sales of the cribs being recalled date back to 1993 and nearly 150,000 of the cribs carry the Fisher-Price logo.

Stork Craft insisted Tuesday that its cribs meet all U.S. and Canadian safety standards.

"If the crib is assembled correctly, maintained correctly and the safety warnings are adhered to, the cribs are safe and they will not be a problem," Jim Moore, president and chief executive of Stork Craft, said in a video news release.

Drop-side cribs have one side that moves up and down to allow parents, especially shorter adults, to lift children from the cribs more easily. There have been 110 incidents of the drop-side detaching from the Stork Craft cribs, according to CPSC.

In the case of Stork Craft and other drop-side cribs, the hardware used to put the crib together can break, deform or become missing after years. There also can be problems with assembly mistakes.

Parents often take the crib apart after one child has grown out of it, and then reassemble the crib later for another baby -- and that can lead to parts that aren't assembled properly.

CPSC is considering mandatory standards for crib design. Given the history of troubles with drop-sides, Tenenbaum said there is a compelling reason to ban the cribs altogether. If she had a baby, she said, she would not put the infant in a drop-side crib.

She advised parents with drop-sides to check the hardware; make sure it's not cracked or missing. People with Stork Craft drop-sides can request a free repair kit that converts the drop-side into a fixed or immovable side.

Consumers can contact Stork Craft, 877-274-0277, to order the free repair kit, or log on to www.storkcraft.com.