Got myself and wife XDS AFB 270 yesterday, with a nice front-load baby seat on my one. Easy to remove the seat for folding. Tried riding a bit, handlebar really quite twitchy compared to old bike. Can get used to though, I think. In any case, first foldie!

SS14 in Subang Jaya. There's at least 2 bike shops on the same row, one nice Lerun one and one chinese uncle one (much cheaper). The chinese uncle one is near to the Caltex petrol station, facing towards the houses (behind the row which faces SS15).

I was quoted RM90. I bought the front-seat (baby sits between you and handlebar), but he also has rear seat where baby sits behind you. My opinion - I rather see my son. Who knows he try to climb out and tercampak on the road without me realizing 

As requested:-

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This is the clamp. Some of the bikes I looked at had seat posts which wouldn't allow this to be attached. For example triangle fork (not sure if that's the right name) and the brake line attached to the seat post. The seat has hooks which go into those holes on the right (front of seat).

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The clamp is attached using normal alan key, can tighten/loosen yourself. It's not VERY strong against side-to-side rotation, but doesn't slide up and down which is the main thing.

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The seat. Comes with a bit of padding, which is really thin. Not a big deal for me. You can see the restraining belt clearly here. It goes over the head, which may be a bit inconvenient.

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Adjustable foot rests (took me 2 rides to realize these were adjustable) via screws at the back.

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This is the hooks at the back which go into the clamp.

Now that I look at it again I think the back seat works exactly the same way, just the hooks come out front rather than back. Not sure if can convert, but I'll try one day. Anyway the shop I mentioned sells front and back seats of this type, both same price.