By middle childhood, nearly all children in developed counties, and a large proportion of children in developing countries, have received ____ and their _____ stronger, which contributes to a lower death rate

What percentage of infants are currently breast fed in the United States and Canada?

a. 10% b. 40% c. 70% d. 99%

Toward the 1970s, scientific evidence had accumulated, and which of the following statements is true?

a. breast milk is far better than any substitute b. the majority of births in the United States take place at home with the use of a midwife c. cesarean sections are far riskier now then they have ever been before d. modern milk-formula is far better than breast milk