Background Federal policy and regulations guide service and support provision to families of children with or at risk for developmental delays or disabilities. These guidelines evolved over time based on the best available research. One such advancement was services were provided at increasingly younger ages as research uncovered the importance of intervening earlier. In the original U.S. special education law passed over 40 years ago, now known as the Individuals with Disabilities Education Act (IDEA 2004), state provision of special education services for preschoolers aged three to five years was voluntary, while services for infants and toddlers, from birth to three years, was not included at all. Guided by evidence-based interventions, the 1986 amendments mandated that states provide special education services to preschoolers, and included an incentive for states to create an early intervention (EI) system for families with infants and toddlers with developmental delays or disabilities. Since its inception, EI under Part C of IDEA specifies birth as the earliest time of eligibility. However, technological advances in prenatal testing have increasingly resulted in families receiving certain diagnoses, such as cleft palate, Down syndrome and other trisomies, and congenital heart disease during the prenatal period (McKechnie et al. 2016).