英语听力文摘 English Digest 193、怎样哺育孩子

　　What Time Of Day Is Best To Feed Infants So That They Fall Asleep
把孩子养大可不是一件容易的事。婴儿没有时间观念，他可不管自己的爸爸妈妈累了一天晚上需要休息。更要命的是，孩子似乎觉得晚上的安静正好是展示自己天籁之音的绝好时机。怎样让宝宝睡得更香？母乳喂养除了对自己的宝宝成长非常有利外，还有另外的功效，一起听听吧。
Parents of young infants know just how rare and valuable uninterrupted sleep can be. As it turns out, the timing¹ of breast milk production may help play a role in facilitating sleeping in an infant.
Some mothers express breast milk during the day and save it for bottle-feeding their infants at night.
This strategy allows fathers or other carers to help with the night-time feedings, and can make late night feeding quicker and easier for the mothers.  However, the plan may actually result in a more sleepless² night for infants and their parents.

　　It turns out that not all breast milk is the same. Breast milk is composed, in part, of compounds called nucleotides-the building blocks of DNA³.Breast milk contains many types of nucleotides, thought to be important for tissue development in growing infants.
Three of these nucleotides are also thought to be associated with sleep and sedation.
A team of Spanish researchers collected breast milk over a twenty-four hour period from thirty healthy moms who had been breast-feeding for at least three months.
They found that the concentrations of these three specific nucleotides associated with sleep and sedation were highest in milk expressed at night, and decreased during the day.
In a follow-up study the researchers created a night-time formula for bottle-fed babies that contained higher concentrations of the three sleep-related nucleotides than normal infant formula.
Infants who received normal formula during the day, and night-time formula after six p.m., fell asleep faster and slept longer than when they were given normal formula milk twenty-four hours a day.
Something for sleepy Moms to consider when planning their bedtime strategy.

1 timing   

n.时间安排，时间选择

参考例句：

• The timing of the meeting is not convenient.会议的时间安排不合适。
• The timing of our statement is very opportune.我们发表声明选择的时机很恰当。

2 sleepless   

adj.不睡眠的，睡不著的，不休息的

参考例句：

• The situation gave her many sleepless nights.这种情况害她一连好多天睡不好觉。
• One evening I heard a tale that rendered me sleepless for nights.一天晚上，我听说了一个传闻，把我搞得一连几夜都不能入睡。

3 DNA   

(缩)deoxyribonucleic acid 脱氧核糖核酸

参考例句：

• DNA is stored in the nucleus of a cell.脱氧核糖核酸储存于细胞的细胞核里。
• Gene mutations are alterations in the DNA code.基因突变是指DNA密码的改变。