A 4-month-old baby born with microcephaly is held by his mother in Brazil, February 11, 2016. Nacho Doce, Reuters/File Photo

ILOILO CITY - Two cases of microcephaly have been recorded here, and one will be investigated to determine if it was caused by the Zika virus.

Iloilo City health officials said the babies were born in the Mandurriao district.

Babies born with microcephaly have smaller heads and exhibit health and developmental problems. Women who were infected with the Zika virus during pregnancy sometimes give birth to babies with microcephaly. Zika comes mostly from the bite of an infected Aedes species mosquito.

Dr. Bernard Caspe of the Iloilo health office said one of the babies already tested negative for Zika, and the birth defect may have been due to other causes.

Caspe explained that microcephaly can also be caused by drinking or smoking while pregnant.

Caspe however also said that they probing the second case of microcephaly to determine if it was caused by Zika.

Health officials said they have limited information about the second microcephaly case because the family of the baby is being uncooperative.

Iloilo City recorded several Zika infections last year, but none of those infected were pregnant.

As of February, there have been 57 Zika cases, the Department of Health said.

• READ: 57 Zika cases in PH; DOH verifying microcephaly case