Inclusion Criteria:  Women from 18 to 35 years of age, pregnant, within the 12th and 20th week (Primary study) or with the intention to get pregnant in the following six months (Secondary study) Hemoglobin over 8 g/dL Accepting to be included in a standard pediatric physical and neurobehavioral follow-up program from birth and to at least 18 months of age. Accepting to receive the Zinc supplement (or placebo) and to ingest it daily from the inclusion to the study and up to the sixth postnatal month Agreement to read and sign the Informed Consent Document  Exclusion Criteria:  Women who do not accept to deliver in a hospital setting, or without immediate access to a proper facility Women with self-reported alcohol or drug addiction Women with a sero positivity to HIV, even if under treatment Women with a pregnancy resulted from assisted or in vitro fertilization techniques Women with an active severe acute respiratory syndrome-Coronavirus (SARS-CoV2) infection