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I see young children being carried by a trailer behind a bicycle often in the PNW region of the US.

What. I see kids on bikes/trailers on bikes in NYC all the time.

Count the wheels ;)

I chose my words carefully. Seems like bike trailers have mostly replaced those kid seats that used to go on the backs of bikes.

I see these all the time in the more affluent areas of brooklyn. Two wheels, kids on the back.

Yepp seats are extremely common now. Nearly all cargo/utility bikes have compatible racks and often feature the child seats installed.

you'll see mobs on 2 wheels in India.