RecruitingBehavioural interventionMother-Baby Study - Relative Reinforcing Value (RRV)The study will test a model of biobehavioral mechanisms involved in the development of a system of emotion, attachment, and nutritive intake in the mother-infant dyad and the association of this system with maternal feeding behavior, child eating behavior, dietary intake, and adiposity. To participate in this study the infant must also be enrolled in long-term observational study, NCT06039878.