We've all been there. The parents taking the training wheels off the bike, and boom -- a scuffed-up elbow and a throbbing knee.

But new research suggests it's scooters -- not bikes -- that kids might have the most painful memories of.

Between 1990 and 2011, toy-related injuries jumped about 40 percent according to research from Nationwide Children's Hospital. Scooters, wagons and tricycles caused 42 percent of injuries to kids between 5 and 17, and 28 percent of injuries to those younger than 5. Scooters alone caused 580,000 injuries between 2000 and 2011. Doctors blame a spike in scooter sales as well as a lack of proper scooter safety equipment.

"If there were three things that you could do to prevent injury to a child on a scooter or other ride-on toy those three things would be wear a helmet, wear a helmet, wear a helmet," said study senior author Dr. Gary Smith.

In all, about 3.3 million kids were sent to emergency rooms for toy-related injuries in those two decades, which breaks down to about one injury every three minutes.

According to the U.S. Consumer Product Safety Commission, toy-related injuries are injuries "related to, but not necessarily caused by, toys."

Younger children are more susceptible to swallowing toys, so parents can be proactive by checking toy packaging for warnings about choking hazards and supervising the children as they play.

The study, published in Clinical Pediatrics, also states injuries on those foot-powered scooters, along with wagons, tricycles and other ride-on toys increased as kids got older.

For more safety tips, especially during this gift-giving season, the Consumer Product Safety Commission provides a full list of toy recalls and safety guidelines.

This video includes images from Getty Images, Tim Pierce / CC BY 2.0, and Jenn Durfey / CC BY 2.0.