I don't remember foot changes with pregnancy with my wife, but I have heard of it happening. Interesting that they never returned to pre-pregnancy size though.
I remember getting into trouble during that time period with her weight. I teased her and called her "whale belly" because she was into workouts and fitness when she got pregnant. I asked the OBGYN at the time how much weight a woman should gain during pregnancy, and he said between 15-25 pounds. I thought my wife looked huge, so I asked her how much she had gained and he said, "15 pounds". That was when I knew I was in trouble! 🙂
But I also teased her about the baby-weight not coming off after the baby. She wanted to prove me wrong so bad that after giving birth it was 22 days before she lost her baby weight. She had to modify her exercise routine, so she did not cause damage to parts of her that had passed a baby, but I thought 22 days to pre-pregnancy weight was pretty darn good.