RecruitingBehavioural interventionMaternal Stress on Human Milk and Infant OutcomesThe overarching purpose of this study is to determine if a modified 8-week mindfulness-based intervention (with a focus on self-compassion; MBSC) or 8 weeks of 2000 IU vitamin D supplementation will reduce stress and increase self-compassion in mothers of preterm infants and beneficially modify the human milk produced, and subsequently improve infant health.