ACEs	Adverse childhood experiences
ADHD	Attention-deficit/hyperactivity disorder
AHR	Aryl hydrocarbon receptor
ANS	Autonomic nervous system
ASD	Autism spectrum disorder
BAs	Bile acids
BBB	Blood–brain barrier
BDNF	Brain-derived neurotrophic factor
CNS	Central nervous system
CPE	Cerebral palsy with epilepsy
CRF	Corticotropin-releasing factor
DG	Dentate gyrus
DMN	Default mode network
ENS	Enteric nervous system
FAS	Fetal alcohol syndrome
FASDs	Fetal alcohol spectrum disorders
FMT	Fecal microbiota transplantation
GABA	Gamma-aminobutyric acid
GBA	Gut–brain axis
GF	Germ-free
GI	Gastrointestinal
GM	Gut microbiome
GPRs	G-protein coupled receptors
HDACs	Histone deacetylases
HPA	Hypothalamic–pituitary–adrenal
5-HT	Serotonin
KYN	Kynurenine
LPS	Lipopolysaccharide
miRNAs	microRNAs
NDDs	Neurodevelopmental disorders
NMDA	N-methyl-D-aspartate
PAE	Prenatal alcohol exposure
PFC	Prefrontal cortex
PRRs	Pattern recognition receptors
ROI	Recurrence of illness index
RSFC	Resting state functional connectivity
SCFAs	Short-chain fatty acids
SGZ	Subgranular zone
SLs	Sphingolipids
SPF	Specific pathogen-free
SSRIs	Selective serotonin reuptake inhibitors
SVZ	Subventricular zone
TDs	Tic disorders
TLRs	Toll-like receptors
TPH1	Tryptophan hydroxylase type 1
TPH2	Tryptophan hydroxylase type 2
TS	Tourette syndrome