隔两年再生第二胎能让小孩更聪明
<p><span word="Forget">Forget</span> <span word="expensive">expensive</span> <span word="educational">educational</span> <span word="DVDs">DVDs</span> <span word="and">and</span> <span word="private">private</span> <span word="tutors">tutors</span>, <span word="the">the</span> <span word="secret">secret</span> <span word="to">to</span> <span word="smart">smart</span> <span word="children">children</span> <span word="could">could</span> <span word="be">be</span> <span word="as">as</span> <span word="simple">simple</span> <span word="as">as</span> <span word="giving">giving</span> <span word="birth">birth</span> <span word="to">to</span> <span word="them">them</span> <span word="two">two</span> <span word="years">years</span> <span word="apart">apart</span>.</p><p><span word="Researchers">Researchers</span> <span word="who">who</span> <span word="studied">studied</span> <span word="thousands">thousands</span> <span word="of">of</span> <span word="children">children</span> <span word="found">found</span> <span word="a">a</span> <span word="two">two</span>-<span word="year">year</span> <span word="gap">gap</span> <span word="to">to</span> <span word="be">be</span> <span word="optimum">optimum</span> <span word="in">in</span> <span word="boosting">boosting</span> <span word="brain">brain</span> <span word="power">power</span>.</p><p><span word="Any">Any</span> <span word="shorter">shorter</span>, <span word="and">and</span> <span word="the">the</span> <span word="reading">reading</span> <span word="and">and</span> <span word="maths">maths</span> <span word="skills">skills</span> <span word="of">of</span> <span word="the">the</span> <span word="older">older</span> <span word="child">child</span> <span word="dipped">dipped</span>.</p><p><span word="The">The</span> <span word="effect">effect</span> <span word="was">was</span> <span word="strongest">strongest</span> <span word="between">between</span> <span word="the">the</span> <span word="first">first</span> <span word="and">and</span> <span word="second">second</span>-<span word="born">born</span>, <span word="but">but</span> <span word="siblings">siblings</span> <span word="in">in</span> <span word="bigger">bigger</span> <span word="families">families</span> <span word="also">also</span> <span word="benefited">benefited</span>.</p>
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