Now, there's a study to back that up.
A study from the University of Iowa confirms that pregnancy can permanently change the size and shape of a woman's feet.
Flat feet are a common problem for pregnant women. The arch of the foot flattens out, possibly because of the extra weight and increased looseness (laxity) of the joints associated with pregnancy. The new study, published in the March issue of the American Journal of Physical Medicine & Rehabilitation, suggests that this loss of arch height is permanent.
"I had heard women reporting changes in their shoe size with pregnancy, but found nothing about that in medical journals or textbooks," said Dr. Neil Segal, University of Iowa associate professor of orthopaedics and rehabilitation. "In order to study this more scientifically, we measured women's feet at the beginning of their pregnancy and five months after delivery. We found that pregnancy does indeed lead to permanent changes in the feet."
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H/T: CBS News