This PDF file includes:

• Supplementary Results
• Fig. S1. Regulatory CpG site −924 in the promoter region of human OXTR is directly conserved in prairie vole Oxtr.
• Fig. S2. Infant and maternal OXTRm from 5 to 18 months.
• Fig. S3. Infant and maternal OXTRm is correlated at both visits.
• Fig. S4. The variance in infant OXTRm increases from 5 to 18 months.
• Fig. S5. Maternal OXTRm does not change from 5 to 18 months.
• Fig. S6. Exploratory latent difference score model.
• Table S1. Infant and maternal OXTR methylation at 5- and 18-month visits.
• Table S2. Table displaying Pearson’s r coefficients for each OXTR methylation measurement and demographic variable.
• Table S3. Mother-reported questionnaire descriptives and demographics.
• Table S4. Descriptives for each subscale of the free-play analysis coding scheme.

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