Valentina Vitoria was born in December.
She has microcephaly, the birth defect that causes an abnormally small head and can cause brain damage as well.
The baby's mother is 32-year-old Fabiane Lopes. She's caring for her daughter in a tiny, windowless one-room apartment in Rio de Janeiro. A whirring fan is the only relief they have from the heat.
In Brazil, doctors are getting closer to untangling the possible connection of Zika to microcephaly. The country has seen thousands of babies born with this birth defect since the virus arrived last year.