interest (ROI) demonstrated negative relationships between GMV and 
gestation week (Fig. 2a and Supplementary Table 2). T ogether, these 
results provide evidence of a global decrease in cortical volume across 
pregnancy. Several sensory and attention subnetworks were particu-
larly sensitive to gestation, including the control (subnetwork B), sali-
ence/ventral attention (subnetwork A), dorsal attention (subnetwork 
B), default (subnetwork A) and somatomotor (subnetworks A and B) 
networks (Supplementary Table 1). Regions driving these network-level 
changes include the bilateral inferior parietal lobe, postcentral gyri, 
insulae, prefrontal cortex, posterior cingulate and somatosensory 
cortex (Fig. 2c, Supplementary Table 2 and validation of findings using 
alternate pipeline in Supplementary Tables 1 and 3). These regions and