In urban areas of Johannesburg, pushchairs (strollers or buggies) are often impractical. They probably would not be welcome on precarious mini-bus taxi rides, neither are they suited to some of the non-existent pavements or uneven roadside verges. I also imagine that for many, the cost of pushchairs is prohibitive (if you had to choose between buying a pushchair or putting dinner on the table, which would it be?). Then you would have the issue of storage. Accommodation for many is compact and crowded. All this means that seeing ladies with babies or toddlers tied to their backs is a very regular, normal occurrence. They also manage to make it look rather easy.