They launched a second model of their collaboration in December, featuring a sunshade installed on the child seat.
However, the increasing number of riders on electric bicycles has resulted in more accidents involving such bikes.
"The vehicle alone weighs nearly 30 kilograms and runs at some level of speed to balance itself.
It's useful, but also dangerous to a rider and pedestrians," said Mio Suzuki, an associate professor who specializes in traffic engineering and traffic policy at Tokai University.
"A lecture on traffic rules and how to ride an electric bicycle safely should be provided when people buy one," she added.