Father of the man: researchers believe that a man's fertility as an adult may be largely laid down in the few months before and after his birth. JENNIFER JACQUEMART / REX FEATURESFrom The Independent:
Levels of 'viable' sperm in human males are falling – and scientists believe they now understand the cause. Infertility can begin in the womb, says Steve Connor.
If scientists from Mars were to study the human male's reproductive system they would probably conclude that he is destined for rapid extinction. Compared to other mammals, humans produce relatively low numbers of viable sperm – sperm capable of making that long competitive swim to penetrate an unfertilised egg.
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