The marked increase in infants born with microcephaly in Brazil after a 2015 
outbreak of Zika virus (Zika virus) disease suggests an association between 
maternal Zika virus infection and congenital microcephaly. To project the timing 
of delivery of infants born to mothers infected during early pregnancy in 1 city 
in Bahia State, Brazil, we incorporated data on reported Zika virus disease 
cases and microcephaly cases into a graphical schematic of weekly birth cohorts. 
We projected that these births would occur through February 2016. Applying 
similar projections to a hypothetical location at which Zika virus transmission 
started in November, we projected that full-term infants at risk for Zika virus 
infection would be born during April-September 2016. We also developed a 
modifiable spreadsheet tool that public health officials and researchers can use 
for their countries to plan for deliveries of infants to women who were infected 
with Zika virus during different pregnancy trimesters.