Ethanol exposure during pregnancy is associated with adverse perinatal outcomes resulting in high healthcare costs. Primary care centers whose attends low risk women will be randomized to apply a motivational intervention program to the mothers.

This is a cluster randomized simple masking controlled trial evaluating the effectiveness of repeated motivational interview (MI) during pregnancy on prevalence of ethanol intake together with offspring´s neurodevelopment.

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Inclusion Criteria:

• Maternal age at recruitment > 18 years
• Speak Spanish fluenty
• Women controlling their pregnancy in Baix Llobregat Center and Hospital Sant Joan de Déu, who will attend their delivery in Hospital Sant Joan de Déu and Parc Sanitari Sant Joan de Déu
• Viable singleton non- malformed fetus
• First trimestre of gestation

Exclusion Criteria:

• Multiple gestations
• Perinatal infections
• Fetal anomalies including chromosomal anormalities or structural malformations detected by ultrasound
• Premature rupture of membranes
• Uncontrolled or/and severe maternal chronic disease
• Language barriers
• Imposibility to obtain the sample (hair lenght below nine centimeters)
• Discolored hair
• Refusal to join the study

Participants must be pregnant women

Patient (participant) will not know the arm of randomization