weeks of the first of the trimester there is a big risk that the brain will not develop properly as it will be. when a baby's head is of the normal size is because the brain develops and pushes up the skull and you have the normal contour of the skull if there's anything that interferes with the destroys that process the brain doesn't develop right in the skull becomes small and. the growing number of babies with microcephaly paralleled the increase in zeek infections but was the condition actually due to the virus. panic spread among pregnant women in rio including dr patricio brazils patients. came couple seventy of them i was very worried about the pregnant women who came to the surgery were very afraid they were who wanted by the specter of microcephaly