Infants who are breastfed have lower arsenic levels than those who are fed formula， according to a U.S. study released Monday that suggested another breastfeeding benefit.

The study， published online in the U.S. journal Environmental Health Perspectives， measuredarsenic in home tap water， urine from 72 six-week-old infants and breast milk from nine women inthe U.S. state of New Hampshire.

Urinary arsenic concentrations were generally low but 7.5 times higher for infants fed exclusively with formula than infants fed exclusively with breast milk， it found.

\"This study's results highlight that breastfeeding can reduce arsenic exposure even at therelatively low levels of arsenic typically experienced in the United States，\" lead author Kathryn Cottingham， professor of Dartmouth College， said in a statement. \" This is an important public health benefit of breastfeeding.\"

Cottingham noted that the findings also apply to new borns in other countries or regions.

\"Breast milk is very low in arsenic， should hold worldwide，\" she wrote in an email to Xinhua. \"Infact， low arsenic in breast milk has already been reported from a number of countries where drinking water arsenic can be very high， including India， Bangladesh， and Chile.\"

Specially， infants with the highest exposures in this study were exposed to more arsenic because of their drinking water， not the formula powder， Cottingham said.

\"So it is the water that should be of most concern in limiting total exposures，\" she said， urging families with private wells in rural areas to have their tap water tested for arsenic.

Arsenic occurs naturally in bedrock and is a common global contaminant of well water. It causes cancers and other diseases， and early-life exposure has been associated with increased fetal mortality， decreased birth weight and diminished cognitive function.

http://www.chinadaily.com.cn/life/2015-02/25/content_19651906.htm

根據(jù)上周一美國的一項研究顯示，母乳喂養(yǎng)又有新的好處，相比較喂配方奶粉的嬰兒，母乳喂養(yǎng)的嬰兒砷含量較低。只喂配方奶的嬰兒尿液中砷含量總體較低，但比純母乳喂養(yǎng)的嬰兒高7.5倍左右。該研究發(fā)現(xiàn)，砷暴露最多的嬰兒主要受飲用水影響，而非配方奶。