According to the NAGC, "Children at age two make sentences like: 'There's a doggie.'

相反如果孩子能用超前的词汇和句子，很有可能他/她就是个资优的孩子。 根据国家天才儿童联合会的报告显示，一个两岁的孩子会说，那儿有个小狗狗。

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ScienceDaily (May 11, 2011) -breastfeeding for four months or more is associated with fewer behavioural problems in children at age 5, an Oxford University study suggests.

近日一项牛津大学的研究显示，母乳喂养多于四个月者，可减少5岁儿童问题行为发生概率。

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Children often throw tantrums at this age.

儿童在这个年龄经常犯脾气。

《牛津词典》

Doctors say eating right and exercising should begin at a young age so that children will not grow into obese adults.

VOA: special.2010.06.07

He claimed that children at this age literally can't understand that others can see the world differently from them.

他认为这个年龄的儿童完全没有意识到,别人眼中的世界,可以与自己看到的世界有所不同

耶鲁公开课 - 心理学导论课程节选

For example, compared to Western countries, women in developing countries start having children at an earlier age.

VOA: special.2010.08.11

Casey, an associate professor of obstetrics and gynecology at the Mayo Clinic, gave birth to her two children at age 38 and at 41.

CNN: Halle Berry joins growing group of older moms

But since the 1980s they have diverged on a range of indicators, from the age at which women have children to the age at which residents die.

ECONOMIST: America in numbers: One nation, divisible | The

The researchers assessed children at the age of three-and-a-half for signs of emotion problems, such as worry and sadness, and behavioural problems, such as hyperactivity.

BBC: NEWS | Health | Father's blues can blight babies