While the CPSC study didn't do specific research on strollers, Jennifer McGeehan, lead author of the study, guesses why it may be dangerous to transport kids with a stroller onto an escalator. It's common sense after all: If a child is not tightly strapped in, he or she could fall out of the stroller. For a parent who is trying to transport a child, he or she could lose grip of the stroller or lose their balance while trying to stabilize the stroller and fall themselves.

"I think the main point here is that there are often safer alternatives to using an escalator when you have a stroller such as in a shopping mall or airport where there are elevators," McGeehan says. "Elevators provide an even surface where parents don't have to do a balancing act to transport their child from floor to floor."