Realistic or unrealistic expectations are formed prior to having the child and can affect the relationship quality of the mother and infant at 3 months and the reported maternal stress levels at 6 months. Violated expectations can either positively or negatively change the course of the relationship quality and stress levels. To test the nature of such relations, a series of regression analyses and one-way ANOVAs examined the associations between maternal expectations (and violations of maternal expectations) and maternal stress at 6 months. Further, mother-infant relationship quality was examined as a possible mediator of this association. Results indicated that prenatal maternal expectations and maternal expectations at 6 weeks were significantly correlated with maternal stress at 6 months. The higher the maternal expectations, the lower the maternal stress. There were no significant relations discovered between maternal expectations and relationship quality or relationship quality and maternal stress. Relationship quality does not mediate the relation of maternal expectations (or violated maternal expectations) and maternal stress. Violated maternal expectations that moved towards realistic did achieve better relationship quality scores, but maternal stress scores stayed consistent no matter the direction of the change.

Social support for Mexican-origin adolescent mothers can benefit mental health. Currently, there is little research on specific dimensions of social support and how they change during the beginning years of parenthood, and even less focusing on the influence each dimension has on adolescent mothers' mental health. This study sought to fill such gaps through the analysis of data from the Supporting MAMI Project at Arizona State University. First, the current study assessed perceptions of emotional, instrumental, and companionship support received from mother figures by Mexican-origin adolescent mothers (N = 204; Mean age at Wave 1 = 16.24, SD = .99) across five years through descriptive statistics and univariate latent growth models. Second, the study assessed the strength of the impact that each dimension of social support had on mental health across six years via conditional growth models. Findings indicated that each dimension of social support shifted in a bi-linear spline shape from Wave 1 to Wave 6, with growth parameters' significance varying for each dimension of support. Each dimension of support was significantly related to depressive symptoms at Wave 6, with varying degrees of influence across growth parameters. Implications for future research and practice are discussed.