MADISON, Wis. — Seven and a half months into Ta-Shai Pendleton’s first pregnancy, her child was stillborn. Then in early 2008, she bore a daughter prematurely. Soon after, Ms. Pendleton moved from a community in Racine that was thick with poverty to a better neighborhood in Madison. Here, for the first time, she had a full-term pregnancy... --snip-- The lives and pregnancies of black mothers like Ms. Pendleton, 21, are now the subject of intense study as researchers confront one of the country’s most intractable health problems: the large racial gap in infant deaths, primarily due to a higher incidence...