Families were assessed at multiple time points (12, 18, 24, and 36 months). At each age, extensive observational assessments with both parents were conducted. Parents also completed a battery of self-report questionnaires. Assessments were conducted over the course of three visits at each age with mother-infant observations conducted at the first visit followed by a developmental assessment at the second visit, then father-infant observations at the third visit. The current study focused on the 12, 24, and 36 month assessments. Families were paid for their participation: $150 for the 12 month assessment, $200 for the 24 month assessment, and $250 for the 36 month assessment.
