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Exponential increase in deliveries? (4,4)

Ross

I believe the answer is:

baby boom

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But I can't explain it at all! Could you help me understand?

(Other definitions for baby boom that I've seen before include "Sudden sharp increase in the birth rate" , "Comparatively small report" , "High-birthrate period" , "Explosive increase in birth rate?" , "increase in arrivals" .)

I've seen this clue in The Hindu.
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