AAC	Augmentative and Alternative Communication
ABA	Applied Behavioral Analysis
ADGRL1	C-terminal phosphorylation of latrophilin-1
ADHD	Attention Deficit and Hyperactivity Disorder
ADI-R	Autism Diagnostic Interview-Revised
ADOS-2	Autism Diagnostic Observation Schedule-Second Edition
ASD	Autism Spectrum Disorder
CAS	Childhood Apraxia of Speech
CLN2	Late-infantile neuronal ceroid lipofuscinosis type 2
DBC	Developmental Behavior Checklist
DD	Developmental Delays
DDX3X	DEAD-Box Helicase 3 X-Linked
DDX3X	DDX3X Syndrome
DSM-5	Diagnostic and Statistical Manual of Mental Disorders
GAD	Generalized Anxiety Disorder
ID	Intellectual Disability
IDD	Intellectual and Developmental Disabilities
MHI	Medical History Interviews
NGS	Next Generation Sequencing
PRISMA	Preferred Reporting Items for Systematic Reviews and Meta-Analyses
RD	Rare Disease
RAC3	Ras-related C3 botulinum toxin substrate 3
RNNDs	Rare Neurodevelopmental Disorders
RSRC1	Arginine/serine-rich coiled-coil 1
SAND	Sensory Assessment for Neurodevelopmental Disorders
SI	Sensory Integration
SIBs	Self-injurious Behaviors
SSP	Short Sensory Profile
WES	Whole Exome Sequencing