(CNN) -- An estimated 1.4 million children under the age of 3 were treated in US emergency departments for nursery product-related injuries between 1991 and 2011, according to a new study in the journal Pediatrics -- an average of more than 66,000 injuries per year.

The study found that the nursery products most commonly associated with injuries were baby carriers -- including carriers worn on the body and car seat-style carriers -- cribs and mattresses, strollers and walkers/baby exercisers. Eighty percent of the injuries were caused by a child falling.

The researchers were interested in how children were potentially getting injured from nursery products, in order understand what steps could be taken toward prevention, according to Tracy Mehan, manager of translational research with the Center for Injury Research and Policy at Nationwide Children's Hospital, who was not involved with the new study.