When I talked with the owner of the cart, (she called it a 'karretje' which translates to little cart) she mentioned her children being in and now her grand children, but it might go back at least one more generation.
Two simple wheels, a simple wooden seat, a little bit of a soft layer for the little one. And a push/pull stick which comes high enough for an adult to handle it comfortable.
Photo taken 5 December 2015, in Castellum Hoge Woerd, which is has its address in Utrecht, the Netherlands.