Two weeks shy of his first birthday, doctors began feeding Jose Wesley Campos through a nose tube because swallowing problems had left him dangerously underweight.

Learning how to feed is the baby's latest struggle as medical problems mount for him and many other infants born with small heads to mothers infected with the Zika virus in Brazil.

"It hurts me to see him like this. I didn't want this for him," said Jose's mother, Solange Ferreira, breaking into tears as she cradled her son, AP reports.