text: *Day2Day control dataset*. To compare our findings against a control 
  group of nonpregnant densely-sampled individuals, we used the Day- 
  2Day dataset23 which offered comparable whole-brain T1 and T2 MTL 
  scans for eight participants (two male) scanned 12–50 times over 2–7 
  months. Each participant was run through the ANTs CT and ASHS pro- 
  cessing pipelines as outlined above (‘Cortical volume and thickness’ 
  and ‘Hippocampal segmentation’). To note, for each participant, we 
  created an SST based on their first two sessions for consistency with 
  the primary dataset; subfield volumes for the T2 MTL scans did not 
  undergo manual retouching. Due to missing header information on 
  the publicly available diffusion scans, we were unable to benchmark 
  our white matter changes with the Day2Day dataset. 
  
  **Statistical analysis.**Statistical analyses were conducted using R (sMRI; 
  version 3.4.4) and DSI Studio (dMRI; Chen-2022-07-31). 