Table 1.

Studies contributing to the review of typical brain development of young children (under 6 years old).

Study	N	Ages	Measures	Study type
Typical Brain development (TD)
Sowell, 2004	45 TD (22F)	5–12yo	Cortical thickness	Longitudinal
Knickmeyer et al., 2008	98 TD (49F)	0–2yo	Brain volumes	Longitudinal
Gilmore et al., 2012	72 TD	0–2yo	Brain volumes	Longitudinal
Lebel and Beaulieu, 2011	103 TD (52F)	5–30yo	Brain volumes	Longitudinal
			Diffusion measures
Brain Development Cooperative Group, 2012a, Brain Development Cooperative Group, 2012b	325 TD	4.5–18yo	Brain volumes	Cross-sectional
				Longitudinal
Brown et al., 2012	885 TD (423F)	3–20yo	Brain volumes	Cross-sectional
			Cortical thickness
			Surface area
			Diffusion measures
Choe et al., 2013	27 TD	3–12mo	Brain volumes	Longitudinal
Hu et al., 2013	306 TD	4–18yo	Brain volumes	Cross-sectional
Nie et al., 2013	445 TD	3–20yo	Cortical thickness	Cross-sectional
			Curvature
			Connectivity
Holland et al., 2014	87 TD (48F)	0–3mo	Brain volumes	Cross-sectional
Krogsrud et al., 2014	244 (218F)	4–22yo	Brain volumes	Cross-sectional
Li et al., 2014b	73 TD	0–2yo	Cortical gyrification	Longitudinal
Lyall et al., 2015	71 TD	0–2yo	Cortical thickness	Longitudinal
			Surface area

TD, typical development; F, female; yo, years old; mo, months