Language delay was associated with a smaller head circumference at birth in asymptomatic infants prenatally exposed to the Zika virus.

Aim: Our aim was to analyse 12-month outcomes of children who were prenatally exposed to the Zika virus and asymptomatic at birth.

Methods: This was an observational, exploratory study of infants exposed to the Zika virus during gestation and born between March 2016 and April 2017 without congenital Zika syndrome. They were followed until the age of 22 months.