Infant and early childhood mental health (IECMH) refers to the development of secure relationships with adults and peers, the ability to manage and express a range of emotions, and explore their environment in the context of their family, community, and culture (Zero to Three, 2017). This four-part webinar series for 2023 defines IECMH and provides participants with important knowledge, awareness, strategies, and tools to support the healthy socioemotional development of children ages birth to 5 years old.