This baby-walking device is called a ([prefix]-)[name] by people from [location]
This Community Wiki answer is intended to bring together all the different possibilities. Users from a given region are encouraged to edit by inserting the terms in use in your region. Reference links are still encouraged, but if all you have is your knowledge of what you and those around you call the thing, then go ahead and contribute.
First, let's establish our terminology:
- Type "A" device has baby in a seated position, low to the ground, and facing the direction of walking.
- Type "B" device has baby laying down, higher off the ground, and facing toward the parent or other person pushing the device.
- Type "C" is a sub-set of Type "A." This type specifically has larger bicycle-style wheels. Normally there are three wheels, but four is not unheard of.
- If there is another type in your region, edit to insert it here.
In England
Type "A" [Baby] buggy or pushchair. The baby may face the parent in some designs but without lying flat. A car seat may be fitted to form the seat part.
Type "B" device is called a perambulator, frequently shortened to just "pram."
Type "C" buggy, pushchair less common
In the United States and Canada
Type "A" is called a stroller (def #4).
Type "B" is called a baby carriage or baby buggy. Note that these dedicated reclining baby transports are relatively rare in the US today; they are still associated with infancy, appearing in baby-related art such as on baby announcements, but aren't a standard part of modern baby gear. Instead, various forms of convertible stroller (or a baby carrier) are commonly used for the few months before baby can sit with assistance. At the high end, these may occasionally also be called prams, possibly because they are literally British imports.
Type "C" is called a jogging stroller.
Two other variants are common in the US:
Umbrella strollers are very lightweight Type "A" devices, designed to fold up, similarly to an umbrella, into a roughly tubular shape.
Twin or double strollers are designed to carry two children (or occasionally more) at once. There are two major sub-types. "Side-by-side" strollers look like two Type "A" or umbrella strollers attached at the hip. Tandem strollers carry children one in front of the other, and come in various configurations (a simple row, back seat higher, sit-and-stand, etc.). Tandem strollers can sometimes accommodate three or even more children, and the term may now refer to any stroller for multiple children, regardless of configuration.
In Australia
The federal government defines a pram as carrying children in a fully recline position and a stroller as carrying them in an upright or adjustable position. In practice, pram appears to be common as a hypernym for the category.
Type "A" Stroller, although buggy is common
Type "B" Pram or, within context, a 4-wheeler
Type "C" Jogger pram or, within context, a 3-wheeler
In India
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In (edit to add name of your region)
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