Women’s feet can grow during pregnancy and stay that way!
Women’s feet can grow and change shape during pregnancy. It’s believed that the arch of the foot flattens out, possibly due to the extra weight and increased looseness of the joints associated with pregnancy, caused by the hormone relaxin (aptly named).
The University of Iowa study followed 49 pregnant women and collected arch measurements, both at rest and when walking; from early pregnancy to five months after childbirth. 60 to 70 per cent of the women in the study saw arch height and measures of arch rigidity decrease significantly, causing corresponding increases in foot length – between 2mm and 10mm – and arch drop.
http://www.livescience.com/27583-foot-size-pregnancy.html