WHO recommends that all infants should be fed exclusively with breast milk for the first six months of life.

世卫组织建议所有婴儿在出生后的前六个月完全用母乳喂养。

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Breast milk may be the best food choice for infants, but most American babies are fed formula at some point.

母乳可能是婴儿最好的食物选择，但是许多美国的婴儿被用配方奶粉喂养。

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The study found that infants who breast-fed for nine months grew up to be significantly more intelligent than those who breast-fed for one month or less.

研究发现婴儿母乳喂养9个月的孩子长大后比那些母乳喂养一个月或更少的要明显更聪明。

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Researchers looked at the nutritional value of including two different varieties of egg yolks as weaning foods for a group of breast-fed and formula-fed infants.

BBC: Egg boost for babies