According to Official Guinness Records,
The largest pram/stroller has an enclosure length of 1.38 m (4 ft 6.3 in) and was achieved by Kolcraft Enterprises, Inc. (USA) in Chicago, Illinois, USA, as verified on 19 September 2016.The pram is a scaled-up version of the Contours Bliss stroller. It was constructed by president of Kolcraft, Tom Koltun, so that adults could test out how the stroller feels before purchasing it for their baby's use.
For a complete list of 2016 records, please visit 2016 Guinness Records in United States.