text: Mean framewise displacement (FWD) estimates from gestation 
  sessions with a 10-min resting-state scan (*n*= 18) were used to indirectly 
  assess whether motion increased throughout pregnancy. Average FWD 
  (mm) was extremely minimal across the entire experiment (*M*= 0.13, 
  s.d. = 0.02, range = 0.09–0.17) and varied only slightly by pregnancy 
  stage (pre,*M*= 0.11 and s.d. = 0.004; first,*M*= 0.11 and s.d. = 0.01; sec- 
  ond,*M*= 0.13 and s.d. = 0.02; third,*M*= 0.16 and s.d. = 0.007; post, 
  *M*= 0.13 and s.d. = 0.01). While mean FWD did correspond with gesta- 
  tion week (*r*= 0.88,*P*< 0.001), controlling for this did not alter our main 
  findings (for example, total GMV remained negatively associated with 
  gestation after partial correlation with FWD (*r*= −0.87 and*P*< 0.001) 
  because motion differences between stages were minuscule (Sup- 
  plementary Fig. 4a). 