RECIFE, BRAZIL - FEBRUARY 03: Mother Daniele Santos holds her baby Juan Pedro, 2-months-old, in their living room as he yawns on February 3, 2016 in Recife, Pernambuco state, Brazil. In the last four months, authorities have recorded thousands of cases in Brazil in which the mosquito-borne Zika virus may have led to microcephaly in infants. Microcephaly results in an abnormally small head in newborns and is associated with various disorders. The state with the most cases is Pernambuco, whose capital is Recife, and is being called the epicenter of the outbreak. (Photo by Mario Tama/Getty Images)