I came through it last week (pregnant wife and 2
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year old child). For inbound immigration, head for the 'Thai passport' queues on the right and keep on walking, you should see a blue sign on the wall that says "Fast track" guarded by a person in a blue uniform. They allow pregnant women and family, young children and family, 70+, disabled and monks.
I think the photo above is for outbound, cos I did that tooπ