"Baby on board" is the message of a small (usually 12 centimetres or 5 inches) sign intended to be placed in the back window of an automobile to caution other drivers that an infant is travelling in the automobile. The intention of the sign is often confused with a warning to emergency personnel (Tot Finder) in case of emergency, as there may be a baby in the vehicle. However, this is historically inaccurate.[1]

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