text: **Cortical volume and thickness changes tied to gestation**
  We then narrowed the aperture to capture changes unfolding within 
  gestation itself (baseline—36 weeks pregnant, 19 scans). Relationships 
  between summary brain metrics were evident over the gestational 
  period as follows: total brain volume, GMV and CT were positively asso- 
  ciated with one another, whereas lateral ventricles, CSF and global QA 
  demonstrated negative relationships with GMV (Supplementary Fig. 1). 
  Changes in GMV were near-ubiquitous across the cortical mantle 
  (Fig. 2a). Most large-scale brain networks exhibited decreases in GMV 
  (Fig. 2b and Supplementary Table 1); indeed, 80% of the 400 regions of 
  interest (ROI) demonstrated negative relationships between GMV and 
  gestation week (Fig. 2a and Supplementary Table 2). Together, 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 