text: **Fig. 2 | Cortical GMV showed widespread change through gestation and**
  **postpartum. a**, Multivariate regression analyses reveal largely negative 
  relationships between gestation week and regional GMV, with only a minority 
  of regions unaffected or increasing over the gestational window (baseline—36 
  weeks). All associations presented here were corrected for multiple comparisons 
  (FDR at*q*< 0.05; nonsignificant values set to zero for interpretability).**b**, Average 
  network change was calculated by estimating GMV percent change from baseline 
  (initial) to 36 weeks gestation (final). Attention and control networks appear 
  most affected.**c**, Six representative regions, classified by major subnetworks, 
  that exhibit pronounced GMV change across gestation. For each panel, we 
  display a scatterplot between average GMV of the ROIs and gestation week 
  (left; gestation sessions only, 19 scans), and summary GMV of ROIs by pregnancy 
  stage across the whole study (right; gestation and postpartum sessions, 26 scans).  Shaded regions in scatterplots represent a 95% confidence interval. Each 
  boxplot represents IQR for each stage, with a horizontal line representing the 
  median value. The whiskers indicate variability outside (±1.5) of this range. 
  Outside values are >1.5× and <3× IQR beyond either end of the box. All statistical 
  tests were corrected for multiple comparisons (FDR at*q*< 0.05) and values 
  were*z*scored and transformed to have a mean of zero and s.d. of one for easier 
  comparison across regions. Please note that the data values shown here are raw 
  (see Supplementary Tables 1 and 2 and Supplementary Data 1 for exhaustive list). 
  Brain visualizations created with R package ggseg48. IQR, interquartile range; 
  Lat, lateral; Med, medial; DMN, default mode network; VisPeri, visual peripheral 
  network; SomMot, somatomotor network; VisCent, visual central network; Cont, 
  control network; TempPar, temporal parietal network; DorsAttn, dorsal attention 
  network; SalVentAttn, salience/ventral attention network. 