The purpose of this Funding Opportunity Announcement (FOA) is to seek applications for unlinked Research Project Sites for the HEALthy Brain and Child Development (HBCD) Study using the cooperative agreement award mechanism. This FOA runs in parallel with companion FOAs that seek applications for linked Research Project Sites (RFA-DA-21-020), a single Consortium Administrative Core (RFA-DA-21-022) and a single Data Coordinating Center (RFA-DA-21-023). It is expected that investigators, upon funding, will work jointly with NIH scientific staff to assist, guide, coordinate, or participate in project activities. This FOA seeks applications to create a consortium of research sites in service of the nationwide, multi-site, multi-modal, longitudinal cohort HBCD Study to prospectively examine brain and behavioral development from birth through childhood, including an emphasis on understanding the impact of in utero substance exposure on outcomes. Research sites will enroll pregnant women and collect data from them and their children using methodologies that include neuroimaging, neurophysiology, behavioral and cognitive assessments and collection of biospecimens.