The fewer babies Americans give birth to, the more small dogs they seem to buy. Birth rates in the US have fallen from nearly 70 per 1,000 women in 2007, to under 63 last year-a 10% tumble. American women birthed almost 400,000 fewer little humans in 2013 than they did six years before. The drop-off has come exclusively among 15- to 29-year-olds.

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